[eglnative] Add -I flags for the clutter dir in the src and build dirs
[eglnative] Add -I flags for the clutter dir in the src and build dirs

These are required to include the Cogl header files.

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