This was exposed by adding EXT_vertex_array_bgra support, previously we would
almost never hit this because color data being present would already prevent
us from using drawStridedFast(). Thanks to Stefan for spotting this.

rpcrt4: Use pseudo-random numbers to generate UUIDs rather than using the (old, deprecated) MAC-address-and-time generation algorithm.

quartz: Only test for the presence or absence of a single filter in a loop. Testing for more than one depends on the order of enumeration, which isn't guaranteed.