PCH-less compilation fix in recently added wxTangoArtProvider.

The use of wxLogDebug() requires inclusion of wx/log.h.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66510 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/arttango.cpp

@@ -27,6 +27,7 @@
 
 #ifndef WX_PRECOMP
     #include "wx/image.h"
+    #include "wx/log.h"
 #endif // WX_PRECOMP
 
 #include "wx/artprov.h"