Don't define __STRICT_ANSI__, we should build both with and without it.

For some reason, wxDialUpManager code defined __STRICT_ANSI__ itself, don't do
it as __STRICT_ANSI__ can be predefined by the compiler resulting in the
redefinition warnings and, in any case, our code should build both with and
without it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74728 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775