Robert Bragg 8cfb158f63 material-arbfp: fix updating params if sharing progs
If a single arbfp program is being shared between multiple CoglMaterials
then we need to make sure we update all program.local params when
switching between materials. Previously we had a dirty flag to track
when combine_constant params were changed but didn't take in to account
that different materials sharing the same program may have different
combine constants.
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