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/d3dtypes.h b/include/d3dtypes.h
index 163cde0..509b5df 100644
--- a/include/d3dtypes.h
+++ b/include/d3dtypes.h
@@ -28,7 +28,7 @@
 /* #include <windows.h> FIXME: Need to include for compatibility. Inclusion caused compile fail */
 
 #include <float.h>
-#include "ddraw.h"
+#include <ddraw.h>
 
 #define D3DVALP(val, prec)      ((float)(val))
 #define D3DVAL(val)             ((float)(val))
@@ -332,7 +332,7 @@
 } D3DMATRIX, *LPD3DMATRIX;
 
 #if defined(__cplusplus) && defined(D3D_OVERLOADS)
-#include "d3dvec.inl"
+#include <d3dvec.inl>
 #endif
 
 typedef struct _D3DVIEWPORT {