[patch] Use -std=gnu99 in tools/llvm-c-test/CMakeLists.txt

[Rafael Espíndola]

With a current mingw (gcc 4.8.1) it looks like I am hitting some variation of

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40278

The net result is that off_t is not defined and the build fails
without this patch.

Cheers,
Rafael
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