minor, remove ptolower() from simd decomp chain
chore, lower threshold for simd/wu-manber decision

As it stands Wu-Manber is still a lot faster.
test, adapt to changed case-mapping policy (glep-simd is always sensitive)
hygiene, use __inline in headers (to be C90 compatible)
Merge branch 'tool/glep'

* tool/glep:
  hygiene, use __inline in headers (to be C90 compatible)
  test, adapt to changed case-mapping policy (glep-simd is always sensitive)
  chore, lower threshold for simd/wu-manber decision
  minor, remove ptolower() from simd decomp chain