build: Do not distribute clutter-json.h
build: Do not distribute clutter-json.h

clutter-jon.h is generated at configure time, we should not distribute it.

This caused a build issue when compiling from a tarballs and out of tree
builds as we ended up with two clutter-json.h one in $(top_srcdir)/json
and the other in $(top_builddir)/json and picked up the wrong one
($(top_srcdir)/json is included first in the include search path).

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