scons: Don't use bundled C99 headers for VS 2013.
Use the ones provided by the compiler instead. NOTE: External trees should be updated to not include '#include/c99' directory directly, but rather rely on scons/gallium.py to do the right thing. Reviewed-by: Brian Paul <email@example.com> Reviewed-by: Roland Scheidegger <firstname.lastname@example.org>
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