acl_addr(): Properly parse acl directives with ports when compiled with HAVE_RFC2553

acl_addr(): Properly parse acl directives with ports when compiled with HAVE_RFC2553

Previously the port wasn't removed from the host and in case of
'permit-access 127.0.0.1 example.org:80' Privoxy would try (and fail)
to resolve "example.org:80" instead of example.org.

Reported by Pak Chan on ijbswa-users@.