Windows: Remove configure test for theme library uxtheme

The library should be present on all supported platforms.

Change-Id: Ib1d55a1a296b4f70978e71d5fda9fa6def6c3930
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

src/widgets/configure.json

@@ -26,14 +26,6 @@
         }
     },
 
-    "tests": {
-        "uxtheme": {
-            "label": "uxtheme.h",
-            "type": "files",
-            "files": [ "uxtheme.h" ]
-        }
-    },
-
     "features": {
         "gtk3": {
             "label": "GTK+",
@@ -56,7 +48,7 @@
         },
         "style-windowsvista": {
             "label": "WindowsVista",
-            "condition": "features.style-windows && features.animation && config.win32 && !config.winrt && tests.uxtheme",
+            "condition": "features.style-windows && features.animation && config.win32 && !config.winrt",
             "output": [ "privateFeature", "styles" ]
         },
         "style-android": {