uitest: make the testing available on windows as well

Change-Id: I6db5bde8860030e6e812c5fc421b5dcc97ed67c3
Reviewed-on: https://gerrit.libreoffice.org/26624Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

vcl/vcl.windows.component

@@ -25,4 +25,8 @@
   <implementation name="vcl::FontIdentificator">
     <service name="com.sun.star.awt.FontIdentificator"/>
   </implementation>
+  <implementation name="org.libreoffice.uitest.UITest"
+      constructor="UITest_get_implementation">
+    <service name="com.sun.star.ui.test.UITest"/>
+  </implementation>
 </component>