build - Remove openssl from base (is now permanently replaced by ressl)

build - Remove openssl from base (is now permanently replaced by ressl)

* Remove openssl and related code that previous commits by John Marino
  replaced with libressl.  Remove build hooks, base now only uses libressl.

* Remove crypto/openssl.  This has been replaced by the openssl
  implementation from ressl.

* Remove lib/libcrypto.  This has been replaced by lib/librecrypto which
  generates a private_crypo library only used by base.

* Remove lib/libssl.  This has been replaced by lib/libressl which
  generates a private_ssl library only used by base.

* NOTE: In addition, John has been working on updating dports to ensure
	that only the ports-based libssl and libcrypto (both nominally
	implemented via ressl and not openssl), and that dports packages
	no longer have any chance of using the private versions of these
	libraries from base.