XWorld: some fixes

Should fix sound on most platforms... right now the main issue is the
mixer callback taking too long and causing the DMA to hang or crash on
some systems. Worked around for now with small chunk sizes, permanent
fix would involve moving mixing totally out of the callback. Also
rewrites input code with code taken from rockboy which was also used
in doom, which finally makes it possible to beat the first level!
Finally, cherry-picks a change from Gregory Montoir's `rawgl' to
always succeed on the code wheel verification.

Change-Id: I8df549c923c5075800c6625c36c8202e53de1d27

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