Rework the ap_MD5Encode() routine to use FreeBSD's algorithm
	and a private significator ("$apr1"); also make it reentrant.
	Abstract the password checking into a new routine,
	ap_validate_password(plaintext, hashed), and modify mod_auth*.c
	to use it instead of each doing the algorithm check.

Obtained from:	FreeBSD 3.0 /usr/src/lib/libcrypt/crypt.c (MD5)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82740 13f79535-47bb-0310-9956-ffa450edef68