Disable wxUSE_STD_CONTAINERS by default for MSVC6.

Disable wxUSE_STD_CONTAINERS by default for MSVC6.

This compiler can't compile its own standard headers with the default options
as it overflows an internal heap. Disable the use of standard containers by
default for it to avoid this problem and indicate that /Zm option must be used
to avoid this.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67380 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775