Merge branch 'master' into ng/master

* master:
  NEWS: fix typo
  NEWS: report recent documentation fix about AM_PROG_MKDIR_P
  NEWS: Automake 2.0 will assume "rm -f" without args work
  NEWS: on assuming "rm -f" without arguments work
  NEWS: fix a couple of typos in older entries
  docs: AM_PROG_MKDIR_P: will not be removed in 2.0 release of Automake
  docs: AM_PROG_CC_C_O: correct imprecise statements about it
  maint: sanity checks in 'check-minimal-autoconf' convenience target
  maint: test minimal supported autoconf through convenience target
  maint: install minimal supported autoconf through convenience targets
  test-lib: typofix in comments

diff --cc .gitignore
index 21ec99f2ce27080e0257ba3e43e63d759d181d31,19da02f71233b83af498610b13277094523c5c5d..8f4bb192cd64fea24f573e03e45b3d98ef934b81
--- 1/.gitignore
--- 2/.gitignore
+++ b/.gitignore
@@@ -1,5 -1,6 +1,7 @@@
 +/lib/am-ng
  /announcement
+ /maintainer/autoconf-*/
+ /maintainer/autoconf-*.tar.gz
  /ChangeLog
  /aclocal.m4
  /configure

diff --cc configure.ac
Simple merge

diff --cc doc/automake-ng.texi
Simple merge

diff --cc maintainer/maint.mk
Simple merge

diff --cc t/ax/am-test-lib.sh
Simple merge