Fix x86 and x86_64 assembly generation

The CFLAGS need to be passed to the x86 assembly generating script so it
can select the right features.

Also add define flags to both x86 and x86_64 so it uses the VPAES and
BSAES implementations if applicable.

Change-Id: Iea2de77609be9c8595e6db0e4542fdff90b60611
11 files changed