Upgrade Clutter requirement to 1.5.10
Upgrade Clutter requirement to 1.5.10

At least Clutter 1.5.10 is required if we want to use the portable
attribute names in the shaders including the cogl_material uniform.

eliasbakken/mash,eliasbakken/mash,clutter-project/mash,clutter-project/mash,clutter-project/mash