- Remove check-{buildroot,rpaths*}, now included in rpm-build >= 4.4.2.1.
    - Include rpmsodiff and dependencies (rpmargs, rpmelfsym, rpmfile, rpmpeek,
        rpmsoname) from ALT Linux's qa-robot package.
    - Drop explicit dependency on patch, pulled in by recent rpm-build.
    - Sync COPYING with http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
    - Work around #250990 in rpmls and rpmdev-extract.
    - Clarify copyright info of rpmdev-* and rpmls.