Our overridden xsgetn() method was never called when using these compilers
because they used their own, non-standard, _Xsgetn_s() instead. Because of
this the stream was always read character by character which was very
inefficient.
Fix the problem by overriding _Xsgetn_s() for these compilers and explicitly
forwarding it to xsgetn().
Closes#13926.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70515 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
We need to include full [io]stream declaration and not just forward declare
them to be able to define classes deriving from them. Surprisingly, including
just <iosfwd> seems to work under most systems but it does not under IRIX.
So include the full <iostream> (or <iostream.h>) to be sure to get what we
need.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63571 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
