[build] Remove -Werror for the maintainer cflags
[build] Remove -Werror for the maintainer cflags

Now that we have Shave in place and don't risk losing warnings
we can avoid -Werror in the anal-retentive maintainer compiler
flags.

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