Bug 520697. Fix build in some weird Vista configurations. r=jmathies

widget/src/windows/nsUXThemeData.h

@@ -38,6 +38,8 @@
  *
  * ***** END LICENSE BLOCK ***** */
 #include <windows.h>
+#include <uxtheme.h>
+
 #include "nscore.h"
 
 #if MOZ_WINSDK_TARGETVER >= MOZ_NTDDI_LONGHORN