(svn r4105) - Feature: Add proper ISO-8859-15 <> LOCALCODE conversion. As the mess that is makefile can't properly support it at the moment, it is only available for MACOSX. Windows doesn't need FS conversion and I have no idea about OS/2 so it's disabled for them.

- CodeChange: Change the function GetCurrentLocale(). It returns the locale from some default environment-variables, plus a custom one defined as parameter. If all fail, it tries $LANG.

saveload.c

@@ -19,6 +19,7 @@
 #include "openttd.h"
 #include "debug.h"
 #include "functions.h"
+#include "hal.h"
 #include "vehicle.h"
 #include "station.h"
 #include "thread.h"
@@ -1314,12 +1315,6 @@ extern bool AfterLoadGame(void);
 extern void BeforeSaveGame(void);
 extern bool LoadOldSaveGame(const char *file);
 
-#if defined(__APPLE__) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_3)
-extern const char *convert_to_fs_charset(const char *filename);
-#else
-#define convert_to_fs_charset(str) (str)
-#endif
-
 /** Small helper function to close the to be loaded savegame an signal error */
 static inline SaveOrLoadResult AbortSaveLoad(void)
 {
@@ -1454,11 +1449,7 @@ SaveOrLoadResult SaveOrLoad(const char *filename, int mode)
 		return SL_OK;
 	}
 
-	if(mode == SL_SAVE) {
-		_sl.fh = fopen(convert_to_fs_charset(filename), "wb");
-	} else {
-		_sl.fh = fopen(filename, "rb");
-	}
+	_sl.fh = (mode == SL_SAVE) ? fopen(OTTD2FS(filename), "wb") : fopen(filename, "rb");
 	if (_sl.fh == NULL) {
 		DEBUG(misc, 0) ("[Sl] Cannot open savegame for saving/loading.");
 		return SL_ERROR;