on all platforms supported by libtool.
* Remove the unnecessary dependencies on glut and perl, and only use
perl as a build dependency.
* Use REPLACE_PERL instead of hand-crafted substitution code.
Bump the PKGREVISION for graphics/OpenRM to 2. Due to the changed
dependency graph, bump the PKGREVISION for packages that use the OpenRM
libraries. In this case, games/genecys-client is the only one, so
bump its PKGREVISION to 2.