[libgo] Replace wait4 by waitpid (PR go/47515)

[Ian Lance Taylor]

Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> writes:

> Currently, libgo uses wait4 unconditionally, which is missing on IRIX
> 6.5.  Fortunately, the rusage * arg is used nowhere, so I've decide to
> replace wait4 by waitpid, which seems to be considerably more portable.

Thanks for the patch, but I wasn't entirely happy with the approach
because it removes the os.Waitmsg.Rusage field.  That field is
inherently system dependent but I would rather not get rid of it.  I
wrote this patch instead, which I hope will also solve the problem.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian

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