configure.ac: Adds some COGL_HAS_XYZ_SUPPORT defines
configure.ac: Adds some COGL_HAS_XYZ_SUPPORT defines

This exposes the ./configured window system/backend options to Cogl via
a set of new COGL_HAS_XYZ_SUPPORT defines:

COGL_HAS_{X11,XLIB,GLX,EGL,EGL_PLATFORM_XYZ,OSX,WIN32,WGL}_SUPPORT

Distrotech/clutter,jigpu/clutter,djdeath/clutter,Distrotech/clutter,Distrotech/clutter,rkudiyarov/clutter_osx,spatulasnout/clutter,GNOME/clutter,rkudiyarov/clutter_osx,dlespiau/clutter,djdeath/clutter,collects/clutter,djdeath/clutter-android,collects/clutter,heysion/clutter-clone,djdeath/clutter-multithreaded,heysion/clutter-clone,djdeath/clutter,djdeath/clutter-android,jigpu/clutter,spatulasnout/clutter,ebassi/clutter,spatulasnout/clutter,spatulasnout/clutter,heysion/clutter-clone,ebassi/clutter,nobled/clutter,jigpu/clutter,kerrickstaley/clutter-vala,djdeath/clutter,heysion/clutter-clone,ebassi/clutter,heysion/clutter-clone,kerrickstaley/clutter-vala,GNOME/clutter,dlespiau/clutter,djdeath/clutter,djdeath/clutter-android,spatulasnout/clutter,jigpu/clutter,GNOME/clutter,djdeath/clutter-android,rkudiyarov/clutter_osx,Distrotech/clutter,ebassi/clutter,rkudiyarov/clutter_osx,collects/clutter,kerrickstaley/clutter-vala,djdeath/clutter,kerrickstaley/clutter-vala,ebassi/clutter,collects/clutter,Distrotech/clutter,nobled/clutter,GNOME/clutter,djdeath/clutter-android,collects/clutter,djdeath/clutter-multithreaded,djdeath/clutter-multithreaded,Distrotech/clutter,nobled/clutter,jigpu/clutter,GNOME/clutter,jigpu/clutter,djdeath/clutter-multithreaded,dlespiau/clutter