Merge branch 'maint'

Merge branch 'maint'

Commits merged from maint:
  dist-xz, dist-bzip2: don't hard-code -9, honor envvar settings
  news: fix typos, grammaros and suboptimal wording
  maint: sync auxiliary files from upstream
  tests: fix spurious failures due to missing 'yywrap()' function
  depcomp: spelling fix
  tests: fix 'distcheck-override-infodir.test' on Cygwin
  cosmetics: typofix in comments
  coverage: undistributed '.am' and '.m4' files are diagnosed
  coverage: required but missing '.am' and '.m4' files are diagnosed
  coverage: expose automake bug#10111 in the testsuite
  fix: regenerate doc/Makefile
  texinfo: work around Solaris 10 xpg4 shell bug in install rules
  configure: report perl version in config.log
  tests: fix spurious failure with older install-info
  maintcheck: fix spurious failure in 'color2.test'
  tests: fix spurious error in 'uninstall-fail.test' on Solaris
  tests: fix typo in 'uninstall-fail.test'

Extra edits:
  * ChangeLog: Remove mention of commit 6da46f31 (2010-10-05), which
  has been superseded by commit c8e01d58 (2011-12-09).  Fix entry
  relative to that commit, to adapt to differences between maint and
  master.