From: Denis Oliver Kropp
Subject: Palette support and 8bit color keying fix

This patch adds support for 8bit palette modes dropping
the RGB332 stuff. It also fixes color keying for 8bit.
testsprite (without -bpp >8) looks correct again.

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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40478