Drop second years from copyright notices
Drop second years from copyright notices

This is a follow up of r316, in which I forgot to drop the second year
in the copyright notice specified by AC_COPYRIGHT.

This change was r323 in Subversion.

jmmv/kyua,jmmv/kyua,rodrigc/kyua,rodrigc/kyua,rodrigc/kyua,jmmv/kyua,jmmv/kyua,rodrigc/kyua