random: Change names of debug envvars.
* random/rndunix.c (start_gatherer): Change GNUPG_RNDUNIX_DBG to GCRYPT_RNDUNIX_DBG, change GNUPG_RNDUNIX_DBG to GCRYPT_RNDUNIX_DBG. * random/rndw32.c (registry_poll): Change GNUPG_RNDW32_NOPERF to GCRYPT_RNDW32_NOPERF.
- Signed-off-by: Werner Koch <wk@gnupg.org>