Replace camel case of internal scrypt functions.
* cipher/scrypt.c (_salsa20_core): Rename to salsa20_core. Change callers. (_scryptBlockMix): Rename to scrypt_block_mix. Change callers. (_scryptROMix): Rename to scrypt_ro_mix. Change callers.
- Signed-off-by: Werner Koch <wk@gnupg.org>