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 configure.ac <srcdir> [MINGW32]: Make sure the value of 'srcdir'
 is in the full /d/foo/bar form.  See the discussion in
 http://lists.gnu.org/archive/html/emacs-devel/2013-09/msg00210.html,
 and in particular
 http://lists.gnu.org/archive/html/emacs-devel/2013-09/msg00252.html
 and its followups, for the details.