Add RGBGFX tests

test/gfx/seed10.bin

@@ -0,0 +1,2 @@
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test/gfx/seed13.bin

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test/gfx/seed27.bin

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+Ž‡
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test/gfx/seed9.bin

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test/gfx/test.sh

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+#!/usr/bin/env bash
+
+[[ -e ./rgbgfx_test ]] || make -C ../.. test/gfx/rgbgfx_test
+[[ -e ./randtilegen ]] || make -C ../.. test/gfx/randtilegen
+
+rc=0
+for f in *.bin; do
+	./rgbgfx_test "$f" || rc=1
+done
+
+exit $rc