[cogl-fixed] Add a double-to-fixed conversion macro
[cogl-fixed] Add a double-to-fixed conversion macro

Since the conversion of a floating point value to a fixed point
value is already done in double precision we can safely expose
a macro that converts a double precision floating point value to
a CoglFixed one.

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