[Automake-NG] [FYI] Merge branch 'master' into ng/master

[Stefano Lattarini]

commit aa9036d432c0c8a671800ceb172303cd9a933e31
Merge: 6d02bf8 9c22243
Author: Stefano Lattarini <address@hidden>
Date:   Wed Jun 20 14:25:19 2012 +0200

    Merge branch 'master' into ng/master

    * master:
      maintcheck: guard against obsolete $required entries
      tests: drop requirement 'makeinfo-html'; 'makeinfo' is enough
      tests: drop requirement 'texi2dvi-o'; 'texi2dvi' is enough
      texi: require Texinfo >= 4.9, related enhancements
      docs: it's not true that DISTCHECK_CONFIGURE_FLAGS is maintainer-reserved

    + Extra non-trivial edits:

    * t/silent-texi.sh ($required): Simply use 'makeinfo and 'texi2dvi',
    instead of (respectively) 'makeinfo-html' and 'texi2dvi-o'.
    * t/texinfo21b.sh: Fix a minor typo in heading comments.
    ($required): Simply use 'makeinfo instead of 'makeinfo-html'
    * lib/am/texibuild.am: Merge the changes done in the master branch to
    the ".texi -> .dvi" and ".texi -> .pdf" recipes into the definition
    of the '$(am__texibuild_dvi_or_pdf)' make function, as well as into ...
    (%.dvi: %.texi), (%.pdf: %.texi): ... calls to that function into these
    pattern rules.

    Signed-off-by: Stefano Lattarini <address@hidden>