libbacktrace patch committed: Only add -Werror for target library

[Ian Lance Taylor]

PR 55312 points out that libbacktrace is adding -Werror incorrectly.  We
should not be adding it when built as a host library, because we don't
know the characteristics of the host compiler.  We should only add it
when built as a target library.  This patch implements that.
Bootstrapped and ran libbacktrace testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian


2012-11-13  Ian Lance Taylor  <iant@google.com>

	PR other/55312
	* configure.ac: Only add -Werror if building a target library.
	* configure: Rebuild.


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