(svn r3276) reverted the last two commits. OSX 10.2 kept finding new stuff to prevent it from running OpenTTD, so now it's not supported anymore

unix.c

@@ -434,7 +434,7 @@ void ShowInfo(const char *str)
 
 void ShowOSErrorBox(const char *buf)
 {
-#if defined(__APPLE__) && !defined(JAGUAR_CROSSCOMPILE)
+#if defined(__APPLE__)
 	// this creates an NSAlertPanel with the contents of 'buf'
 	// this is the native and nicest way to do this on OSX
 	ShowMacDialog( buf, "See readme for more info\nMost likely you are missing files from the original TTD", "Quit" );