FindLibEv.cmake: change license to BSD with permission
-# EOS - The CERN Disk Storage System
-# Copyright (C) 2015 CERN/Switzerland
-# This program is free software: you can redistribute it and/or modify it under
-# the terms of the GNU General Public License as published by the Free Software
-# Foundation, either version 3 of the License, or (at your option) any later
-# version. This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
-# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
-# details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see http://www.gnu.org/licenses/.
-#
# Try to find libev
# Once done, this will define
#
