Mach64 fixes :

- Added support for 8-bit RAMDAC mode
- Added ABGR8888 mode
- Add support for mono blitter source
- Identify RAMDAC type correctly
- Use correct colours for hardware cursor
Fixes issues in Corel Linux.

src/vid_ati68860_ramdac.h

@@ -2,8 +2,16 @@ typedef struct ati68860_ramdac_t
 {
         uint8_t regs[16];
         void (*render)(struct svga_t *svga);
+        
+        int dac_write, dac_pos;
+        int dac_r, dac_g;
+        PALETTE pal;
+        uint32_t pallook[2];
+        
+        int ramdac_type;
 } ati68860_ramdac_t;
 
 void ati68860_ramdac_out(uint16_t addr, uint8_t val, ati68860_ramdac_t *ramdac, svga_t *svga);
 uint8_t ati68860_ramdac_in(uint16_t addr, ati68860_ramdac_t *ramdac, svga_t *svga);
 void ati68860_ramdac_init(ati68860_ramdac_t *ramdac);
+void ati68860_set_ramdac_type(ati68860_ramdac_t *ramdac, int type);