x/sys/unix: does not build under 1.4 any more

[davecheney]

arm64 and ppc64 are not know as GOARCHes to Go 1.4

% $HOME/go1.4/bin/go build 
# golang.org/x/sys/unix
./syscall_linux_arm64.go:65: Getpagesize redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:73
./syscall_linux_arm64.go:70: TimespecToNsec redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:87
./syscall_linux_arm64.go:72: NsecToTimespec redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:89
./syscall_linux_arm64.go:78: TimevalToNsec redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:95
./syscall_linux_arm64.go:80: NsecToTimeval redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:97
./syscall_linux_arm64.go:87: Pipe redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:106
./syscall_linux_arm64.go:100: Pipe2 redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:119
./syscall_linux_arm64.go:111: (*PtraceRegs).PC redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:130
./syscall_linux_arm64.go:113: (*PtraceRegs).SetPC redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:132
./syscall_linux_arm64.go:115: (*Iovec).SetLen redeclared in this block
        previous declaration at ./syscall_linux_amd64.go:134
./syscall_linux_arm64.go:115: too many errors

[bradfitz]

@minux is on it.

[davecheney]

Closed in 8bcc2db