textproc/krep: Disable all SIMD hacks/detections in favor of CPUTYPE

All SIMD "hacks/detection" should be disabled as we have CPUTYPE and
the current approach is also broken as host might not share the same
CPU features as target.

Reported by: diizzy@ (via e-mail)
Approved by: db@, yuri@ (Mentors, implicit)