In r219639, SSSE3 instruction set support was backported to our gcc.
In r219639, SSSE3 instruction set support was backported to our gcc.

Therefore, we also need to install the new tmmintrin.h header containing
the related intrinsic functions, similar to xmmintrin.h, emmintrin.h,
etc.

Reported by:	George Liaskos <geo.liaskos@gmail.com>

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