Add copyright and license info for m4 files and third party libs#636

jafingerhut wants to merge 3 commits intop4lang:mainp4lang/PI:mainfrom

jafingerhut:add-copyright-license-info-for-automake-files-copied-from-elsewherejafingerhut/PI:add-copyright-license-info-for-automake-files-copied-from-elsewhereCopy head branch name to clipboard