xfree86: vgahw: drop unused code and make only locally used functions static
Several functions in hw/xfree86/vgahw/ are either not used anymore (also not by drivers) or only used locally in one source file, so these can be cleaned up.
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Several functions in hw/xfree86/vgahw/ are either not used anymore (also not by drivers) or only used locally in one source file, so these can be cleaned up.