NEX-2714 update m4, bison, libxslt
NEX-2715 update bzip2, unzip, gtar
NEX-2717 update libexpat, libidn, libffi, ncurses
Merge pull request #26 in USR/nza-userland from ~ALEXANDER.EREMIN/nza-userland-up:master to master

* commit 'fdb6d5b41a7716d9101e8e9ec4e2e51002f8af59':
  NEX-2714 update m4, bison, libxslt NEX-2715 update bzip2, unzip, gtar NEX-2717 update libexpat, libidn, libffi, ncurses