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

[Stefano Lattarini]

commit 2e8b7d956ad143617740e3e3db8003fc89e88f2f
Merge: b30799f 0093d5e
Author: Stefano Lattarini <stefano.lattar...@gmail.com>
Date:   Fri Dec 14 17:41:48 2012 +0100

    Merge branch 'maint' into ng/master

    * origin/maint:
      maint: prefer $(MKDIR_P) over $(mkinstalldirs) in maintainer rules