fix windows build

after my commit 60e78fbb "fdo#82577: Handle Font"

Author: Noel Grandin <noel@peralex.com>
Date:   Tue Sep 16 10:09:58 2014 +0200

    fdo#82577: Handle Font
be ignored, and an empty message aborts the commit.

Change-Id: Id87e9ac86b457962fa156fdb1607dfe779b8564d

canvas/source/directx/dx_textlayout_drawhelper.cxx

@@ -246,7 +246,7 @@ namespace dxcanvas
 
         // create the font
         const ::com::sun::star::rendering::FontRequest& rFontRequest = rCanvasFont->getFontRequest();
-        Font aFont(
+        vcl::Font aFont(
             rFontRequest.FontDescription.FamilyName,
             rFontRequest.FontDescription.StyleName,
             Size( 0, ::basegfx::fround(rFontRequest.CellSize)));