Fix load state bug

In some games PGSX memory pointer was not being set after saved states were reloaded, causing the GPU plugin to fall back on fixed point values.

Ensure that PGSX memory pointer in GPU plugin is always set upon initialisation.

win32/gui/plugin.c

@@ -30,6 +30,7 @@
 #include "NoPic.h"
 #include "misc.h"
 #include "sio.h"
+#include "pgxp_gte.h"
 
 extern void LidInterrupt();
 
@@ -310,6 +311,7 @@ int _OpenPlugins(HWND hWnd) {
 
 	ret = GPU_open(hWnd);
 	if (ret < 0) { SysMessage(_("Error Opening GPU Plugin (%d)"), ret); return -1; }
+	GPU_pgxpMemory(0, PGXP_GetMem());
 	ret = SPU_open(hWnd);
 	if (ret < 0) { SysMessage(_("Error Opening SPU Plugin (%d)"), ret); return -1; }
 	SPU_registerCallback(SPUirq);