feat(d3d9-util): Add separate module for d3d9 utils/helpers

Currently includes:

* dx9 error formatting helpers. Turn error codes into readable
  text
* Vertex struct and helper function

src/main/d3d9-util/dxerr9.c

@@ -0,0 +1,23 @@
+// Source:
+// https://github.com/Alexpux/mingw-w64/blob/master/mingw-w64-crt/libsrc/dxerr9.c
+/*
+
+    dxerr9.c - DirectX 9 Error Functions
+
+    Written by Filip Navara <xnavara@volny.cz>
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+*/
+
+#define DXGetErrorString DXGetErrorString9A
+#define DXGetErrorDescription DXGetErrorDescription9A
+#define DXTrace DXTraceA
+#define DXERROR9(v, n, d) {v, n, d},
+#define DXERROR9LAST(v, n, d) \
+    {                         \
+        v, n, d               \
+    }
+#include "dxerr.c"