PropertyValue must be a complete type here (Windows --disable-pch)

...when instantiating implicitly defined special member functions of
VCL_DLLPUBLIC FilterConfigItem

Change-Id: I3128a475e9363b0dc0960fbb34e25c64c2270f69
Reviewed-on: https://gerrit.libreoffice.org/66063
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

include/vcl/FilterConfigItem.hxx

@@ -24,11 +24,11 @@
 #include <vcl/dllapi.h>
 
 #include <rtl/ustring.hxx>
+#include <com/sun/star/beans/PropertyValue.hpp>
 #include <com/sun/star/uno/Reference.h>
 #include <com/sun/star/uno/Sequence.hxx>
 
 namespace com { namespace sun { namespace star { namespace beans { class XPropertySet; } } } }
-namespace com { namespace sun { namespace star { namespace beans { struct PropertyValue; } } } }
 namespace com { namespace sun { namespace star { namespace task { class XStatusIndicator; } } } }
 namespace com { namespace sun { namespace star { namespace uno { class Any; } } } }
 namespace com { namespace sun { namespace star { namespace uno { class XInterface; } } } }