Fix compile on Linux.

stepmania/src/NotesLoaderMidi.cpp

@@ -21,7 +21,7 @@
 
 #include "global.h"
 #include "NotesLoaderMidi.h"
-#include "Song.h"
+#include "song.h"
 #include "Steps.h"
 #include "RageLog.h"
 #include "NoteData.h"
@@ -807,4 +807,4 @@ bool MidiLoader::LoadFromDir( const RString &sDir, Song &out )
  * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
  * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  * PERFORMANCE OF THIS SOFTWARE.
- */
+ */