[Bug go/86535] FreeBSD/PowerPC64 - Building Go Frontend support for gcc 7.3.0 fails

[clhamilto at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86535

--- Comment #24 from Curtis Hamilton <clhamilto at gmail dot com> ---
Okay, I modified the code and got pass that issue.  But have run into another
issue that has me stumped.  I'm getting the below error:

/usr/ports/lang/gcc9/work/gcc-9-20190217/libgo/go/runtime/os_freebsd.go:22:9:
error: reference to undefined name 'sysctl'
   22 |  ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil,
0)
      |         ^