tests: link test-conformance against libm
tests: link test-conformance against libm

https://bugzilla.gnome.org/show_bug.cgi?id=677921

collects/clutter,djdeath/clutter,ebassi/clutter,Distrotech/clutter,djdeath/clutter-android,GNOME/clutter,heysion/clutter-clone,collects/clutter,djdeath/clutter,ebassi/clutter,collects/clutter,djdeath/clutter-android,heysion/clutter-clone,Distrotech/clutter,ebassi/clutter,ebassi/clutter,djdeath/clutter,GNOME/clutter,djdeath/clutter,collects/clutter,Distrotech/clutter,heysion/clutter-clone,Distrotech/clutter,ebassi/clutter,djdeath/clutter-android,djdeath/clutter,heysion/clutter-clone,GNOME/clutter,djdeath/clutter-android,djdeath/clutter,heysion/clutter-clone,jigpu/clutter,jigpu/clutter,djdeath/clutter-android,jigpu/clutter,GNOME/clutter,jigpu/clutter,Distrotech/clutter,jigpu/clutter,Distrotech/clutter,GNOME/clutter,jigpu/clutter,collects/clutter