md: Simplify the message digest dispatcher md.c.
* src/gcrypt-module.h (gcry_md_spec_t): Move to ... * src/cipher-proto.h: here. Merge with md_extra_spec_t. Add fields ALGO and FLAGS. Set these fields in all digest modules. * cipher/md.c: Change most code to replace the former module system by a simpler system to gain information about the algorithms.
- Signed-off-by: Werner Koch <wk@gnupg.org>