chore, for SIMD routine XXX also define HAVE_XXX
fix, allow building on 32bit targets as well
chore, check if target platform is actually LP64
Merge branch 'bld/old-gcc'

* bld/old-gcc:
  chore, check if target platform is actually LP64
  fix, allow building on 32bit targets as well
  chore, for SIMD routine XXX also define HAVE_XXX