Generate debug information in MSVC 11/12 builds too.

This partially (as MSVC 10 projects were already correct) backports r76475
from trunk, see #16236.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76770 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775