* cipher/md.c (_gcry_md_hash_buffer): Remove inactivation of FIPS mode
  when MD5 is used
  (_gcry_md_hash_buffers_extract): Ditto.
* src/fips.c (gcry_is_fips_mode_inactive): Removed
  (_gcry_inactivate_fips_mode): Removed
  (_gcry_is_fips_mode_inactive): Removed
* src/g10lib.h (_gcry_inactivate_fips_mode): Remove declaration
  (_gcry_is_fips_mode_inactive): Remove declaration
* global.c (_gcry_vcontrol): Update the GCRYCTL_FIPS_MODE_P
  (_gcry_set_allocation_handler): Silently ignore custom alocation
  handlers in FIPS mode