Allow CompilerTest_compilerplugins_clang to include css/uno/Reference.hxx

Change-Id: Ib35d8fcc41e1c49bfef01c980b25c051190cb753
Reviewed-on: https://gerrit.libreoffice.org/32990Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>

solenv/CompilerTest_compilerplugins_clang.mk

@@ -22,4 +22,6 @@ $(eval $(call gb_CompilerTest_add_exception_objects,compilerplugins_clang, \
     compilerplugins/clang/test/vclwidgets \
 ))
 
+$(eval $(call gb_CompilerTest_use_udk_api,compilerplugins_clang))
+
 # vim: set noet sw=4 ts=4:

solenv/gbuild/CompilerTest.mk

@@ -40,6 +40,7 @@ $(eval $(foreach method, \
     add_objcobjects \
     add_objcxxobject \
     add_objcxxobjects \
+    use_udk_api \
 , \
     $(call gb_CompilerTest__forward_to_Linktarget,$(method)) \
 ))