fixed overrid(d)en typo

millert@ and jmc@ agree that "overriden" is wrong

Move build machinery for libcrypto from libssl/crypto to libcrypto, as well
as configuration files; split manpages and .pc files between libcrypto and
libssl.
No functional change, only there to make engineering easier, and libcrypto
sources are still found in libssl/src/crypto at the moment.

ok reyk@, also discussed with deraadt@ beck@ and the usual crypto suspects.