We do not need a separate file for two compatibility wrapper functions.

ok miod@
Add ChaCha to libcrypto, based on djb's public domain implementation.

ok deraadt@
+ e_chacha.c, and bump minor
Enable use of the assembly code for AES, BN, SHA1, SHA256 and SHA512.
Enable use of the assembly code for BN (Montgomery) and SHA1.
Enable use of assembly code for AES, BN (Montgomery), SHA1, SHA256 and SHA512.
RC4 assembler code is not used, as it runs about 35% slower than the C code.