[bfin] Define LIB_SPEC for bfin-elf

[Jie Zhang]

This patch defines LIB_SPEC for bfin-elf, such that -lc will be added
when linking with option -shared. With this patch, shared libpthread
in uClibc will be built successfully with bfin-elf-gcc. Otherwise,
there are many undefined references.

Is it OK?

Jie
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