matches the project name and doesn't share a media file extension

Change-Id: I9ad6c0a180e36c41f8fc49120615a070ea792a30

Added hiding global symbols for macho32 and macho64 in x86inc.asm.
This was done to fix exported symbol issue in Chrome build.

Change-Id: I08d5c559b985b82f655b537469fee125615e78c0

Current x86inc.asm didn't handle 32bit PIC build properly.
TEXTRELs were seen in the library built. The PIC macros from
libvpx's x86_abi_support.asm was used to fix this problem.
The assembly code was modified to use the macros.

Notes: We need this fix in for decoder building. Functions in
encoder will be fixed later.

Change-Id: Ifa548d37b1d0bc7d0528db75009cc18cd5eb1838

'CPU amdnop' is supported by YASM only.

Change-Id: Ia3f7c2ba6d3bdf2889b62f5c6127fd515d7c7394

Some projects must define only win64 for Windows 64bit builds using
yasm.

Change-Id: I1d09590d66a7bfc8b4412e1cc8685978ac60b748

Change-Id: Iedb4c3b4171d8640cc525727b4c3658e2bb400db

Change-Id: I3582c64200eed3606a4b57a9f78624ec46041461

Change-Id: I6802731a4d15feef5ce62993dc505ded55c40f7e