gcc: install AMD intrinsics header ammintrin.h
gcc: install AMD intrinsics header ammintrin.h

This file was included in the changes from r251212 and originated
in the pre-GPLv3 gcc43 branch.

MFC after:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase