chore, conditionalise on popcnt instructions for glep-simd-guts
Merge branch 'bld/configure'

* bld/configure:
  chore, conditionalise on popcnt instructions for glep-simd-guts
hygiene, kick abstract loadu instruction
cosmetics, kick suffixes (_epi8, _si, et al.) from our mmX intrinsics
minor, support MMX extension in glep-simd-guts
hygiene, clarify mmX bit sizes
fix, PEBKAC, actually provide a _m64_movemask_pi8() that works as advertised
hygiene, don't use ACCU_BITS and MWNDZ interchangably
minor, call simd glep in 32bit case again, requiring MMX at the moment though
fix, PEBKAC, hard-define MWNDZ (mini-window size) to 64U again
Merge branch 'bld/32bits'

* bld/32bits:
  fix, PEBKAC, hard-define MWNDZ (mini-window size) to 64U again
  minor, call simd glep in 32bit case again, requiring MMX at the moment though
  hygiene, don't use ACCU_BITS and MWNDZ interchangably
  fix, PEBKAC, actually provide a _m64_movemask_pi8() that works as advertised
  hygiene, clarify mmX bit sizes
  minor, support MMX extension in glep-simd-guts
  cosmetics, kick suffixes (_epi8, _si, et al.) from our mmX intrinsics
  hygiene, kick abstract loadu instruction
minor, fall back to sequential decomp routine if no SIMD helpers are available
minor, also fall back on hand-crafted popcnt32_seq()
Merge branch 'bld/32bits'

* bld/32bits:
  minor, also fall back on hand-crafted popcnt32_seq()
  minor, fall back to sequential decomp routine if no SIMD helpers are available