libgo patch committed: Use libbacktrace

[Ian Lance Taylor]

This patch to libgo changes it to use libbacktrace.  Previously
backtraces required the Go package debug/elf to register itself with the
runtime during the package initialization, which only worked if the
program actually imported debug/elf one way or another.  Bootstrapped
and ran Go testsuite on x86_64-unknown-linux-gnu.  Committed to
mainline.

Ian


2012-09-28  Ian Lance Taylor  <iant@google.com>

	* Makefile.def: Make all-target-libgo depend on
	all-target-libbacktrace.
	* Makefile.in: Rebuild.


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