[PATCH] Fix libbacktrace and libiberty tests fail on sanitized GCC due to wrong link options.

[Maxim Ostapenko]

Hi,

When I ran Asan tests under Asan-bootstrapped GCC 5.0, I've noted, that 
tests for libiberty and libbacktrace fail to link with sanitized 
libbacktrace.a and libiberty.a because of missing -static-libasan 
-fsanitize=address linker flags.

This patch adds necessary flags to provide a linkage of these tests in 
bootstrap-asan case.

I've checked that regression tests pass with disabled bootstrap, normal 
bootstrap (stage1, stage3) and Asan-bootstrap (stage 1, stage3) on 
x86_64-unknown-linux-gnu.

Does the patch look sane?

-Maxim
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