Merge branch 'master' into testsuite-work

Merge branch 'master' into testsuite-work

* master:
  check: don't use multi-line coloring for the report
  ansi2knr: deprecate, it will go away in the next major release
  docs: primary/prefix combination "pkglib_PROGRAMS" is now invalid
  docs: replace obsolete @vindex entry with a useful one
  tests: more checks on portable fd redirection in TESTS_ENVIRONMENT
  docs: AM_DISTCHECK_CONFIGURE_FLAGS is for corner cases