random: Replace RMD160 by SHA-1 for mixing the CSPRNG pool.
* cipher/sha1.c (_gcry_sha1_mixblock_init): New. (_gcry_sha1_mixblock): New. * random/random-csprng.c: Include sha1.h instead of rmd.h. (mix_pool): Use SHA-1 instead of RIPE-MD-160 for mixing.
- Signed-off-by: Werner Koch <wk@gnupg.org>