Remove --enable-auto-import ld flag on Mingw
Remove --enable-auto-import ld flag on Mingw

Since symbols are now decorated by dllimport/dllexport on
Windows, automatic import of symbols is no more needed.

distcheck ok.

git-svn-id: 5ee003ee0248588d1eb078e5f99fce27d40e2213@3722 59136d6a-6dff-0310-91ca-bfc5db6e1932

sofianehaddad/ot-svn,sofianehaddad/ot-svn,sofianehaddad/ot-svn,sofianehaddad/ot-svn,sofianehaddad/ot-svn