ips_manager: add snes vram hack

Author: taoenwen

src/burner/libretro/ips_manager.cpp

@@ -768,6 +768,10 @@ void GetIpsDrvDefine()
 						nIpsDrvDefine |= IPS_PGM_SNDOFFS;
 						continue;
 					}
+					if (0 == strcmp(tmp, "IPS_SNES_VRAMHK")) {
+						nIpsDrvDefine |= IPS_SNES_VRAMHK;
+						continue;
+					}
 					if (0 == strcmp(tmp, "IPS_LOAD_EXPAND")) {
 						nIpsDrvDefine |= IPS_LOAD_EXPAND;
 						nIpsMemExpLen[EXP_FLAG] = 1;