Fix Windows build for Visual Studio 2012

For more information see:

http://msdn.microsoft.com/en-us/library/4hwaceh6(v=vs.110).aspx

Also it looks like limits includes math somehow so move the include lower.

Change-Id: Ifec3a59370f7ad0e4bdc58c470e4f14f7db33660
Reviewed-on: https://gerrit.libreoffice.org/5423Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

svx/source/customshapes/EnhancedCustomShapeGeometry.cxx

@@ -17,8 +17,12 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#include <limits>
+#ifdef WNT
+#define _USE_MATH_DEFINES // for M_SQRT2
+#endif
+
 #include <cmath>
+#include <limits>
 
 #include "svx/EnhancedCustomShapeGeometry.hxx"
 #include <com/sun/star/drawing/EnhancedCustomShapeGluePointType.hpp>