x/sys/unix: cannot build for solaris

[mikioh]

The package is still under curation, just as a reminder.

# golang.org/x/sys/unix
/swdev/src/golang.org/x/sys/unix/zsyscall_solaris_amd64.go:9: undefined: syscall in syscall.newLazySO
/swdev/src/golang.org/x/sys/unix/zsyscall_solaris_amd64.go:10: undefined: syscall in syscall.newLazySO
/swdev/src/golang.org/x/sys/unix/zsyscall_solaris_amd64.go:353: undefined: syscall in syscall.Signal

[binarycrusader]

I have a complete set of fixes for Solaris, just waiting on my contributor agreement to be in place to contribute.

For those curious, this is what I have so far:
https://github.com/binarycrusader/sys/commit/8871e87c480f8edb55a7f445c853937e59bcdd37

[gopherbot]

CL https://golang.org/cl/13400 mentions this issue.