libgo patch committed: Add timeout for tests

[Ian Lance Taylor]

This patch to libgo adds a timeout for the libgo tests.  The default is
60 seconds.  It can be changed by an argument to gotest, which would
normally be used as, e.g.,
  make GOTESTFLAGS="--timeout=120" check-target-libgo

Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.  This is PR go/48242.

Ian

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