mcrypt: update license
mcrypt: update license

From `src/bits.c`:

    /*
     *    Copyright (C) 1998,1999,2000,2007 Nikos Mavroyanopoulos
     *
     * 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/>.
     */

chrisfinazzo/homebrew-core,stgraber/homebrew-core,makigumo/homebrew-core,mbcoguno/homebrew-core,uyjulian/homebrew-core,filcab/homebrew-core,nandub/homebrew-core,nbari/homebrew-core,lemzwerg/homebrew-core,JCount/homebrew-core,zyedidia/homebrew-core,lemzwerg/homebrew-core,mfikes/homebrew-core,Linuxbrew/homebrew-core,cblecker/homebrew-core,zyedidia/homebrew-core,sjackman/homebrew-core,cblecker/homebrew-core,uyjulian/homebrew-core,sjackman/homebrew-core,mbcoguno/homebrew-core,mfikes/homebrew-core,adam-moss/homebrew-core,nandub/homebrew-core,Homebrew/homebrew-core,stgraber/homebrew-core,spaam/homebrew-core,mbcoguno/homebrew-core,Homebrew/homebrew-core,dsXLII/homebrew-core,adam-moss/homebrew-core,JCount/homebrew-core,nbari/homebrew-core,chrisfinazzo/homebrew-core,Linuxbrew/homebrew-core,filcab/homebrew-core,Moisan/homebrew-core,Moisan/homebrew-core,makigumo/homebrew-core,spaam/homebrew-core,dsXLII/homebrew-core