Remove crypto/*/lib targets

To make for a more accurate dependency graph (and improved parallelism),
libcrypto.a will be built in a single recipe defined in crypto/Makefile,
rather than accumulating objects via 'ar r'.

This was automatically applied by RemoveCryptoSubdirLibTarget() in:
https://code.google.com/p/mike-bland/source/browse/openssl/update_makefiles.py
Build libcrypto.a with a single archive command

All of the dependencies are declared and built before the libcrypto.a archive
is built. This enables fast, accurate, and parallelizable builds--especially
incremental builds.