Add support for specifying AS and LD to configure.
Removed 32 bit MMX/SSE asm.  I still have Makefile.orig and dynamic left to do
Update doc/INSTALL for OSX builds.
configure re-built after 0cd5e47. Also, move x86-mmx.h back from unused,
and fix MMX targets so they use core assembler code + Alain's NT and
Deepika's DES.
Added logic to fall back to MMX, prior to x86, IF SSE2 native test fails
Drop HAVE_SSE2 et al from blake2 code (in favor of standard ones like
__SSE2__). Also drop JOHN_AVX and JOHN_XOP from autoconf - they were
never needed.
AC: On OSX, detect when 'as' can't assemble AVX instructions and
inform about the workaround.
Changes needed to properly build a MMX, now that 32 bit mmx.S are gone
Reduced the OMP scale.
Removed legacy mmx.S code, mostly from dynamic formats
This should be the last file needed for the 32 bit *-mmx.S removal