vendor: Update golang.org/x/sys

Update golang.org/x/sys to ac767d655b305d4e9612f5f6e33120b9176c4ad4
that same with agent.

Shortlog for golang.org/x/sys:
    ac767d6 windows/svc/mgr: add ability to set a reboot message and command when a service fails
    1b2967e unix: implement RFCOMM sockets on Linux
    7b495ad unix: update Dockerfile to Go 1.11beta1
    3c6ecd8 windows: add missing file attributes
    ce36f38 unix: regenerate syscall wrappers for linux/ppc64{,le}
    151529c windows, windows/svc/mgr: add ability to modify service recovery settings.
    7138fd3 unix: do not return non-nil error for 0 errno in FcntlInt
    c4afb3e unix: fix TestUtimesNanoAt for filesystems with 1-second resolution time stamps
    a200a19 unix: don't check atime in TestUtimesNanoAt
    63fc586 unix: use private copy of ustat_t on Linux
    ad87a3a unix: check faccessat flags parameter on Linux
    fc8bd94 unix: don't use deprecated syscalls on linux/arm64
    f24d3d4 unix: add Faccessat on Solaris
    6c888cc windows: replace uintptr in crypto structs
    8014b7b windows: follow convention for generated code comment
    8883426 plan9: follow convention for generated code comment
    9e6071e unix: follow convention for generated code comment
    56ede36 unix: add rtc defines and types
    8ee9f3e unix: add Faccessat on NetBSD
    f4b713d unix: add Faccessat on OpenBSD
    a9e25c0 unix: update Dockerfile to Ubuntu 18.04, Linux 4.17, and Go 1.10.3
    bff228c windows: update TOKEN_ALL_ACCESS according to WinNT.h
    24c297a unix: support compiling with gccgo on linux/386
    7c1e4f3 unix: drop use function stub for gccgo
    9527bec cpu: fix gccgo build
    bc2ef10 cpu: add gccgo implementation
    538ab54 cpu: introduce and export type CacheLinePad
    c11f84a unix: don't check atime in TestStatx
    d4cedef unix: make Nfgenmsg a type definition
    3135538 unix: add nftables defines and types
    b269ba2 unix: fix TestXattr on android
    04b8398 unix: fix or skip failing tests on android and iOS
    e2c7578 unix: delete TestDevices for *BSD and Darwin
    56ad15c windows: add QueryServiceStatusEx function
    77b0e43 unix: add symlink-safe *xattr functions on darwin
    f3b0f5f unix: skip TestStatx if the operation is not permitted
    028bb33 unix: delete TestDevices test for Solaris
    88eb85a unix: add tests for *xattr functions
    dc67e5b windows: address error reported by vet
    0b6bef9 unix: add {get,set,remove,list}xattr on darwin
    7f59abf unix: update openbsd/amd64 to OpenBSD 6.3
    89da893 unix: exclude AUDIT_RECORD_MAGIC constant on darwin
    7c87d13 unix: add tpacket types and constants on Linux
    d0faeb5 unix: fix TestSCMCredentials to not fail when root
    9950ad1 unix: add statfs and filesystem magic constants on Linux
    7dfd129 windows: address vet reports
    64746a4 unix: address vet's finding of  wrong argument size
    7db1c3b cpu: use t.Fatal instead of t.Fatalf
    6f686a3 unix: add ErrnoName and SignalName
    78d5f26 windows/svc: correct MOVL instruction in sys_amd64.s
    4adea00 cpu: new package
    f67ecc1 unix: use Fstatat for Stat on linux/amd64
    cbbc999 unix: use pselect on amd64 to satisfy Android
    bb9c189 unix: 32-bit MIPS splice system call returns int, not int64
    79b0c68 unix: add Linux block device ioctl types and constants
    a2a4594 unix: avoid extra syscall on send/recvmsg on Linux
    3ccc7e5 unix: fix typos in linux/types.go.
    9b00609 unix: add tcp_md5sig on Linux
    b126b21 unix: re-export Fsid and Sigset_t Val member on Linux
    ecfd8b5 unix: implement getrtable/setrtable syscalls on OpenBSD
    2f57af4 unix: add wrapper around perf_event_open on Linux
    2281fa9 unix: don't export any padding/alignment fields on all platforms
    f6f3529 unix: add a step to mkall.go that generates ABI headers to be referenced from types.go
    3b87a42 unix: update Dockerfile to Linux 4.16 and Go 1.10.1
    1d206c9 unix: add FcntlInt
    fcb792c unix: unify Getsockopt*
    f67933e unix: solicit EPERM via wrong PID in creds test.
    378d26f unix: add CRTSCTS on netbsd and openbsd
    2de2067 unix: add sendfile support on Solaris
    13d03a9 unix: add GetsockoptLinger and GetsockoptTimeval
    91ee8cd unix: use strings.IndexByte instead of for loops
    1e3c777 unix: don't export padding fields on Darwin
    c488ab1 unix: add Fadvise on linux/{arm64,mipsx.mips64x,ppx64x,sparc64}
    ee8db00 unix: add Fadvise on NetBSD
    bb729a5 unix: fix TestFchmodat on Illumos
    6416052 unix: enable TestFchmodat for all Unices
    dd203b8 unix: add Fchmodat on NetBSD
    7ceb54c unix: add Fchmodat on DragonflyBSD
    f8f1a95 unix: add Fchmodat on OpenBSD
    d8e400b unix: fix example
    01acb38 plan9, unix, windows: add paragraph breaks in docs
    0deb464 unix: add Exec call
    2f1e207 unix: add IFLA attributes on linux/sparc64
    cc7307a unix: add Fstatat on Darwin
    5c2edb5 unix: add Fstatat on OpenBSD
    89ac7f2 CONTRIBUTING.md: remove note about not accepting Pull Requests
    932fb22 unix: add Fstatat on NetBSD
    2477406 unix: add Fstatat on FreeBSD
    bcaab34 unix: don't export padding fields on DragonflyBSD
    0edb963 unix: add Fstatat on DragonflyBSD
    6035cb0 unix: don't export padding fields on Solaris
    591c159 unix: add Fstatat on Solaris
    8c0ece6 unix: extend rlimit test on Linux
    c28acc8 unix: fix seek while compiling with gccgo under arm and 386
    7dca6fe plan9: use bytes.IndexByte instead of a for loop
    e64a828 unix: use bytes.IndexByte instead of a for loop
    349b81f unix: skip SchedAffinity test on single CPU system
    dd2ff4a unix: fix nil pointer dereference in Select on linux/{arm64,mips64x}
    f6cff07 windows/registry: improve ReadSubKeyNames permissions

Fixes: #2284

Signed-off-by: Hui Zhu <[email protected]>

Gopkg.toml

@@ -40,7 +40,7 @@
 
 [[constraint]]
   name = "golang.org/x/sys"
-  revision = "88d2dcc510266da9f7f8c7f34e1940716cab5f5c"
+  revision = "ac767d655b305d4e9612f5f6e33120b9176c4ad4"
 
 [[constraint]]
   name = "github.com/sirupsen/logrus"