Add missing header for minimalistic builds not using PCH.

wxWindow might not be fully declared in dcbase.cpp but we need its full
declaration for wxDCImpl::InheritAttributes() so explicitly include
wx/window.h -- while this is usually already included from somewhere else it
might not be in minimal builds with a lot of features disabled.

Closes #13380.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68522 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/dcbase.cpp

@@ -35,6 +35,7 @@
 #ifndef WX_PRECOMP
     #include "wx/math.h"
     #include "wx/module.h"
+    #include "wx/window.h"
 #endif
 
 #ifdef __WXMSW__