remove some code that is now unused after guenther's changes in 1.20.
Remove defines for unwanted OS support...

ok miod@
Initial KNF.
I've replaced everything in this file. ISC liscense it with my copyright
Initial KNF.
More KNF.
More KNF.
Initial KNF.
Initial KNF.
Initial KNF.
Fully kill FIPS API. Forcible certification conflicts with the goals of a
free software project. ok beck deraadt

Ports calling FIPS_mode_set(1): mongodb
remove OPENSSL_realloc_clean usage here - replace with intrinsics to make
it obvious what should happen.
ok tedu@