trial, attempt to demonolithify accuify()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Revert "trial, attempt to demonolithify accuify()"

This reverts commit e7fe8a898d3c7ff1788f88d7bb61f7c7d4acf7a4.
chore, check for gcc's x86intrin.h

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, properly check for __m128i and __m256i
hygiene, get the include conditionals in glep-guts.c right
ego, put licence header on top of glep-guts.c
hygiene, put additional SIMD type check conditionals in glep-guts.c
chore, check for _tzcnt_u64() as well as popcnt routines
Merge branch 'tool/glep'

* tool/glep:
  chore, check for _tzcnt_u64() as well as popcnt routines
  hygiene, put additional SIMD type check conditionals in glep-guts.c
  ego, put licence header on top of glep-guts.c
  hygiene, get the include conditionals in glep-guts.c right
  chore, properly check for __m128i and __m256i
  chore, check for gcc's x86intrin.h
  Revert "trial, attempt to demonolithify accuify()"
  trial, attempt to demonolithify accuify()