Revert "Get rid of color_table_cache member as well"

This reverts commit 9c47003f41.

mednafen/pce_fast/vdc.h

@@ -35,6 +35,7 @@ typedef struct
         bool bw;       // Black and White
         uint8 dot_clock; // Dot Clock(5, 7, or 10 MHz = 0, 1, 2)
         uint16 color_table[0x200];
+        uint32 color_table_cache[0x200];
         uint16 ctaddress;
 } vce_t;