Use angle brackets (<>) rather than quotes ("") for the include
directives in our .h files. This should avoid some potentially nasty
surprises for Winelib apps.

include/dmdls.h

diff --git a/include/dmdls.h b/include/dmdls.h
index 6bb0b58..dfe73c5 100644
--- a/include/dmdls.h
+++ b/include/dmdls.h
@@ -20,7 +20,7 @@
 #ifndef __WINE_DMUSIC_DLS_H
 #define __WINE_DMUSIC_DLS_H
 
-#include "dls1.h"
+#include <dls1.h>
 
 typedef long PCENT, GCENT, TCENT, PERCENT;
 typedef LONGLONG REFERENCE_TIME, *LPREFERENCE_TIME;