license: relicense "libnm-core/nm-vpn-dbus-interface.h" under LGPL-2.1+

>>>

  H0=a3e75f32
  commit_has_file() {
      git ls-tree -r "$1" | grep -q "\\s$2"\$
  }
  print_commit_authors() {
      git --no-pager log --full-history --follow --no-merges --pretty='format:<%ae>' $H0 -- "$1" | sort | uniq
  }
  print_blame_authors() {
      local LAST_H

      if commit_has_file $H0 "$1"; then
          LAST_H=$H0
      else
          LAST_H="$(git log --full-history --no-merges -n1 --pretty='format:%H' $H0 -- "$1")"^1
      fi
      git blame --no-progress -C -C -C20 -M -M10 -e "$LAST_H" -- "$1" | sed 's/.*\(<[^>]\+@[^>]\+>\).*/\1/' | sort | uniq
  }
  print_grep() {
      git --no-pager log -p --full-history --follow $H0 -- "$1" | grep -i '[a-z0-9]@\|author\|copyright' | sort | uniq
  }
  prefix() {
      sed "s/^/>>>$1 /"
  }
  collect_all() {
      for F; do
         print_commit_authors "$F" | prefix 1
         echo
         print_blame_authors "$F" | prefix 2
         echo
         print_grep "$F" | prefix 3
      done |
      sort |
      uniq |
      sed 's/@/(at)/'
  }

  collect_all \
      include/NetworkManagerVPN.h \
      libnm-core/NetworkManagerVPN.h \
      libnm-core/nm-vpn-dbus-interface.h \
      libnm-util/NetworkManagerVPN.h \
      ;

<<<

gives:

>>>1 <atulhjp(at)gmail.com>
>>>1 <bgalvani(at)redhat.com>
>>>1 <danw(at)gnome.org>
>>>1 <dcbw(at)redhat.com>
>>>1 <evan(at)ebroder.net>
>>>1 <jklimes(at)redhat.com>
>>>1 <lkundrak(at)v3.sk>
>>>1 <tambet(at)gmail.com>
>>>1 <thaller(at)redhat.com>
>>>1 <warp(at)aehallh.com>
>>>2 <atulhjp(at)gmail.com>
>>>2 <blueowl(at)centrum.cz>
>>>2 <danw(at)redhat.com>
>>>2 <dcbw(at)redhat.com>
>>>2 <evan(at)ebroder.net>
>>>2 <lkundrak(at)v3.sk>
>>>2 <tambet(at)gmail.com>
>>>2 <thaller(at)redhat.com>
>>>2 <warp(at)aehallh.com>
>>>3 [...] Red Hat, Inc.