clutter-1.0: Update to 1.15.90
clutter-1.0: Update to 1.15.90

rvu95/vala,Distrotech/vala,spidermonkdust/vala,GNOME/vala,spidermonkdust/vala,Distrotech/vala,flobrosch/vala-fixes,frida/vala,flobrosch/vala-fixes,xdave/pvala,rvu95/vala,GNOME/vala,GNOME/vala,frida/vala,frida/vala,rvu95/vala,Distrotech/vala,frida/vala,frida/vala,GNOME/vala,flobrosch/vala-fixes,spidermonkdust/vala