libgo patch committed: Correct syscall.Setenv if no setenv

[Ian Lance Taylor]

This patch to libgo corrects the implementation of syscall.Setenv for
systems that do not have the setenv library call, but only have putenv.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu and
i386-sun-solaris2.9.  Committed to mainline and 4.7 branch.

Ian

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