libgo patch committed: Correct runtime.Callers skip argument

[Ian Lance Taylor]

With the change to using the libbacktrace code, inlined functions now
picked up.  Previously the skip parameter to runtime.Callers was
adjusted based on inlining that was ignored.  This patch corrects it so
that the right thing happens.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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