When creating dll wrapper libraries, dlltool will setup only symbols with
the @<number>, even if -k (--killat) is given. This is bad, because then all
autoconf based configure script won't find these symbols. Instead, the
symbol without the @ should be added as well. The attached patch will archive
this (when -k is given).

Note the patch is against the last version of binutils, but applies and
works fine to the current version.