plaform-independent handling of Portable.ini. Portable mode no longer saves inside of a directory called Portable in Win32 (made the platform-independent logic simpler).

stepmania/src/StepMania.cpp

@@ -949,6 +949,10 @@ int main(int argc, char* argv[])
 	/* Almost everything uses this to read and write files.  Load this early. */
 	FILEMAN = new RageFileManager( argv[0] );
 	FILEMAN->MountInitialFilesystems();
+	bool bPortable = DoesFileExist("Portable.ini");
+	if( !bPortable )
+		FILEMAN->MountUserFilesystems();
+
 
 	/* Set this up next.  Do this early, since it's needed for RageException::Throw. */
 	LOG		= new RageLog;