fix glTexImage2D not flushing data cache#52
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The current glTexImage2D implementation doesn't flush data caches before using
dmaCopyWords, despite what thelibndsdocumentation suggests here.This issue was not reproducible in DeSmuME, I have only encountered it on real hardware (a DSi XL).
Comparison before the change vs after the change.
Before:
After:
This fixes #50