Merge branch 'maint'

* maint:
  THANKS: update e-mall address for Ralf Corsepius
  lang, suffix rules: don't require C stuff needlessly
  tests: expose automake bug#14560
  maint: add a missing copyright notice
  sync: update config.guess from upstream
  tests: expose automake bug#13928
  comments: fix some out-of-sync refs to test scripts
  tests: expose automake bug#13940

diff --cc NEWS
Simple merge

diff --cc bin/automake.in
Simple merge

diff --cc lib/am/distdir.am
Simple merge

diff --cc t/list-of-tests.mk
Simple merge