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

diff --git a/include/dplay.h b/include/dplay.h
index e893262..3956e05 100644
--- a/include/dplay.h
+++ b/include/dplay.h
@@ -19,7 +19,7 @@
 #ifndef __WINE_DPLAY_H
 #define __WINE_DPLAY_H
 
-#include "ole2.h"
+#include <ole2.h>
 
 #ifdef __cplusplus
 extern "C" {