Define BS_TYPEMASK for the compilers which don't have it.

Fixes compilation with MinGW after wxMSWOwnerDrawnButton introduction.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76466 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add wx/msw/ownerdrawnbutton.h to {make,project} files.

In particular, ensure that it's installed when using configure+make.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76467 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775