Changes related to stream includes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@818 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/wxexpr.cpp

@@ -20,7 +20,15 @@
 #pragma hdrstop
 #endif
 
+#if wxUSE_IOSTREAMH
 #include <fstream.h>
+#else
+#include <fstream>
+#  ifdef _MSC_VER
+      using namespace std;
+#  endif
+#endif
+
 #include <stdarg.h>
 #include <ctype.h>
 #include <string.h>