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/netspi.h b/include/netspi.h
index acecf46..ff1e996 100644
--- a/include/netspi.h
+++ b/include/netspi.h
@@ -21,8 +21,8 @@
 #ifndef _NETSPI_H_
 #define _NETSPI_H_
 
-#include "windef.h"
-#include "winnetwk.h"
+#include <windef.h>
+#include <winnetwk.h>
 
 /*
  * Note: The Unicode variants of all these routines/structures