css::awt::Size must be a complete type here (Windows --disable-pch)

...when instantiating implicitly defined special member functions of
SVX_DLLPUBLIC EnhancedCustomShape2d, due to seqSubViewSize member

Change-Id: I7dd22ba0602461c1bbe2e1e5351e161f2e098c37
Reviewed-on: https://gerrit.libreoffice.org/73404
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

include/svx/EnhancedCustomShape2d.hxx

@@ -22,6 +22,7 @@
 
 #include <svx/msdffdef.hxx>
 #include <svx/sdasitm.hxx>
+#include <com/sun/star/awt/Size.hpp>
 #include <com/sun/star/uno/Sequence.h>
 #include <com/sun/star/beans/PropertyValues.hpp>
 #include <svl/itemset.hxx>
@@ -40,7 +41,6 @@
 #include <vector>
 
 namespace com::sun::star::awt { struct Point; }
-namespace com::sun::star::awt { struct Size; }
 
 class Color;
 class SdrObject;