updated for version 7.4a.037
Problem:    Win32: When mouse is hidden and in the toolbar, moving it won't
	    make it appear. (Sami Salonen)
Solution:   Add tabline_wndproc() and toolbar_wndproc(). (Ken Takata)
Added tag v7-4a-037 for changeset 91d478da863e
updated for version 7.4a.038
Problem:    When using MSVC 2012 there are various issues, including GUI size
	    computations.
Solution:   Use SM_CXPADDEDBORDER. (Mike Williams)
Added tag v7-4a-038 for changeset 8f983df0299f