psx.h: define root counter specs as macros

ISO C considers enumerators of int type, so any value larger than
0x7FFFFFFF is considered invalid on platforms where sizeof (int) == 4.
A workaround for this limitation on the language is to use macros
instead.

libpsx/include/psx.h

@@ -125,18 +125,14 @@ enum cop0_register_numbers
 /**
  * Root counter specifications
  */
-
-enum psx_rcnt_specs
-{
-	/** Pixel clock*/
-	RCntCNT0		= 0xf2000000,
-	/** Horizontal sync*/
-	RCntCNT1		= 0xf2000001,
-	/** System clock / 8 */
-	RCntCNT2		= 0xf2000002,
-	/** VSync (VBlank) */
-	RCntCNT3		= 0xf2000003,
-};
+/** Pixel clock*/
+#define RCntCNT0 0xf2000000
+/** Horizontal sync*/
+#define RCntCNT1 0xf2000001
+/** System clock / 8 */
+#define RCntCNT2 0xf2000002
+/** VSync (VBlank) */
+#define RCntCNT3 0xf2000003
 
 /**
  * Root counter modes