libffi intel icc and src/x86/ffi64.c

[Aaron Webster]

I've seen some things on the internet about people trying to build libffi
with intel icc, which doesn't define __int128_t. 

I've found that you can just use 

long long sse[MAX_SSE_REGS];

instead of __int128_t in src/x86/ffi64.c, and everything will compile fine.
I think the real intel type is something like __m128, but I'm not 100%
sure.

--
Aaron Webster