This property expands to either (just) "d" (even in Unicode builds) or
nothing depending on whether we're building in debug or release and can
be used to construct the configuration-independent names for the third
party libraries, most of which use just this suffix and not wxSuffix,
which expands to "ud" in (Unicode) debug build.
This allows to use exactly the same link dependencies for both debug and
release configurations, as demonstrated by the updated minimal MSVS
project file, which is convenient when creating new projects not using
wxwidgets.props, as it allows to enter the dependencies just once and
use them for all build configurations instead of having to enter them
separately for the debug and the release ones.
ef22f4c3db