[patch] Avoid stack protection when building libgcc

[Chung-Lin Tang]

Hi,
this patch adds explicit avoiding of stack protection in libgcc build 
options. Many Linux distros enable -fstack-protector by default, 
building libgcc with it, and causing a link dependency on libssp that's 
sometimes inconvenient.

For a scenario, please see here:
http://lists.linaro.org/pipermail/linaro-toolchain/2010-August/000144.html

Ok, for trunk?

Thanks,
Chung-Lin
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