Update waffle to 1.5.1.
Use USES=compiler:c11 to allow it to build on older FreeBSD versions.
Enable GLX support.
Fix plist when cmake is in debug build mode.
Submitted by: dumbbell@
Add waffle 1.5.0.
Waffle is a cross-platform C library that allows one to defer selection
of an OpenGL API and window system until runtime.
It is used by the piglit, Mesa's OpenGL test suite, to test multiple
OpenGL flavors in a cross-platform way.