Reordered the CALLBACK and WINAPI directives so that it compiles with
old g++ versions.

diff --git a/include/mmddk.h b/include/mmddk.h
index a1de5d4..b08cdac 100644
--- a/include/mmddk.h
+++ b/include/mmddk.h
@@ -278,7 +278,7 @@
 typedef JOYCALIBRATE *LPJOYCALIBRATE;
 
 /* prototype for joystick message function */
-typedef UINT (CALLBACK JOYDEVMSGPROC)(DWORD dwID, UINT uMessage, LPARAM lParam1, LPARAM lParam2);
+typedef UINT CALLBACK (JOYDEVMSGPROC)(DWORD dwID, UINT uMessage, LPARAM lParam1, LPARAM lParam2);
 typedef JOYDEVMSGPROC *LPJOYDEVMSGPROC;
 
 /* messages sent to joystick driver's DriverProc() function */