Update to 0.18.1, and add patches from upstream git to fix build with
isl-0.13.

version: 0.18.1
date: Tue Jul  2 07:32:18 PDT 2013
changes:
	- Update to isl 0.12.1
	- Support for OpenScop column coordinates
	- Consistent output on different platforms
Updated math/cloog to 0.18.1
Fix build with doxygen-1.8.7 and depend on it.
Bump PKGREVISION.
Updated www/tidy to 20091027nb5
Use BUILDLINK_TRANSFORM to edit -ldl as required, fixing the build for Linux.
Update to 0.87

* Use xorg.libXfixes for newer native xorg.
  Fix build of libXfixes consumers.
Updated pkgtools/x11-links to 0.87