[testsuite] Improve LTO testing with -r

[Jie Zhang]

Some LTO tests do relocatable linking. Some target boards set a linker 
script which can't be used for relocatable linking. This patch changes 
lto.exp to use the default linker script instead if -r is found in the 
options.

make check RUNTESTFLAGS="lto.exp"

has no regressions on x86_64-unknown-linux-gnu with this patch.

Is it OK?


Regards,
-- 
Jie Zhang
CodeSourcery
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