wii: Hardcode absolute directory path

The game now looks for files in a `RSDKv5` folder at the root
of the SD card. This will prevent issues with forwarders and
other homebrews that don't change directories before loading
the executable file.

RSDKv5/RSDK/User/Core/UserStorage.cpp

@@ -1163,6 +1163,10 @@ void RSDK::SKU::InitUserDirectory()
 
     SKU::SetUserFileCallbacks("./", NULL, NULL);
 
+#elif RETRO_PLATFORM == RETRO_WII
+
+    SKU::SetUserFileCallbacks(BASE_PATH, NULL, NULL);
+
 #else
 
     SKU::SetUserFileCallbacks("", NULL, NULL);

makefiles/Wii.cfg

@@ -1,6 +1,9 @@
 STATIC = 1
 STATICGAME = 1
 
+# Path where data will be stored/read from
+BASE_PATH=/RSDKv5/
+
 ifeq ($(RSDK_ONLY),1)
 $(error RSDK_ONLY must not be defined for Wii builds)
 endif