New batch of ATI Mach8/32 changes:

1. Hopefully fixed the passthrough stuff for good and fixed typo's in the IBM 8514/A poll function about the cursor.
2. Eliminated the ibm8514_on global variable in favor of a struct variable to be consistent with XGA.

src/include/86box/vid_8514a.h

@@ -42,6 +42,8 @@ typedef struct ibm8514_t {
     int type;
     int local;
     int bpp;
+    int on;
+    int accel_bpp;
 
     uint32_t vram_size;
     uint32_t vram_mask;