build fix for non-PCH builds (thanks to buildbot emails ;))

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52871 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

utils/ifacecheck/src/xmlparser.h

@@ -15,6 +15,7 @@
 #include <wx/txtstrm.h>
 #include <wx/dynarray.h>
 #include <wx/xml/xml.h>
+#include <wx/platinfo.h>
 
 // helper macros
 #define LogMessage(fmt, ...)   { wxPrintf(fmt "\n", __VA_ARGS__); fflush(stdout); }