Replace StgCreateStorageEx stub with call to StgCreateDocfile and add
required STGFMT_* enumerations.

diff --git a/include/objbase.h b/include/objbase.h
index f552dbe..8bad522 100644
--- a/include/objbase.h
+++ b/include/objbase.h
@@ -463,6 +463,11 @@
 #define STGM_NOSNAPSHOT		0x00200000
 #define STGM_DIRECT_SWMR	0x00400000
 
+#define STGFMT_STORAGE		0
+#define STGFMT_FILE 		3
+#define STGFMT_ANY 		4
+#define STGFMT_DOCFILE 	5
+
 typedef struct tagSTGOPTIONS
 {
     USHORT usVersion;