What I care about here is that setting peFlags != 0 doesn't cause errors
either during ddraw palette creation or DIB section creation. peFlags
isn't an alpha channel, but P8 textures abuse it that way, hence the
name of the test. It probably has deeper meaning in DDSCL_NORMAL when
the X server is running in 8 bit paletteindexed mode, but I don't think
we really care about this.