devel/apr and www/apache2 can coexist now (in fact, this has been
true since ports/www/apache2/Makefile rev. 1.136), so remove the
checks that prevented both from being installed on the same system.
No PORTREVISION bump because anyone who was affected by this change
would not have been able to install this port anyway.
Submitted by: Craig Rodrigues <email@example.com> (MAINTAINER)