Changes to 8514/A compatible stuff (November 2nd, 2024)

1. vga_on global variable removed, as it didn't play well with 2 subsystems at once (8514/A and XGA both enabled).
2. Emulate the Foreground/Background Color aliases of PIX_TRANS properly when not executing a command.
3. Voodoo 3D override now works properly (again) with Mach32 PCI cards and others by turning the 8514/A timer off and on accordingly.

src/cpu/x86.c

@@ -384,9 +384,6 @@ softresetx86(void)
     if (soft_reset_mask)
         return;
 
-    if (ibm8514_active || xga_active)
-        vga_on = 1;
-
     reset_common(0);
 }