Revert "Backport AC_PATH_PROGS_FEATURE_CHECK"

This reverts commit 52b699ec.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

autotools/ac_path_progs_feature_check.m4

-# Backport of AC_PATH_PROGS_FEATURE_CHECK from autoconf 2.64
-# (available since version 2.62)
-#
-# The following code comes from lib/autoconf/programs.m4,
-# in the autoconf 2.64 source code. Its copyright is:
-
-#
-# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
-# 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software
-# Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-# 02110-1301, USA.
-
-# As a special exception, the Free Software Foundation gives unlimited
-# permission to copy, distribute and modify the configure scripts that
-# are the output of Autoconf.  You need not follow the terms of the GNU
-# General Public License when using or distributing such scripts, even
-# though portions of the text of Autoconf appear in them.  The GNU
-# General Public License (GPL) does govern all other use of the material
-# that constitutes the Autoconf program.
-#
-# Certain portions of the Autoconf source text are designed to be copied
-# (in certain cases, depending on the input) into the output of
-# Autoconf.  We call these the "data" portions.  The rest of the Autoconf
-# source text consists of comments plus executable code that decides which
-# of the data portions to output in any given case.  We call these
-# comments and executable code the "non-data" portions.  Autoconf never
-# copies any of the non-data portions into its output.
-#
-# This special exception to the GPL applies to versions of Autoconf
-# released by the Free Software Foundation.  When you make and
-# distribute a modified version of Autoconf, you may extend this special
-# exception to the GPL to apply to your modified version as well, *unless*
-# your modified version has the potential to copy into its output some
-# of the text that was the non-data portion of the version that you started
-# with.  (In other words, unless your change moves or copies text from
-# the non-data portions to the data portions.)  If your modification has
-# such potential, you must delete any notice of this special exception
-# to the GPL from your modified version.
-#
-# Written by David MacKenzie, with help from
-# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
-# Roland McGrath, Noah Friedman, david d zuhn, and many others.
-#
-# The code was modified by ultrotter@google.com, adding surrounding ifdefs.
-
-m4_ifdef([AC_PATH_PROGS_FEATURE_CHECK],,
-  m4_define([AC_PATH_PROGS_FEATURE_CHECK],
-  [_$0([$1], [$2], [$3], m4_default([$4], [:]), [$5])dnl
-  ]))
-
-m4_ifdef([_AC_PATH_PROGS_FEATURE_CHECK],,
-  m4_define([_AC_PATH_PROGS_FEATURE_CHECK],
-  [if test -z "$$1"; then
-    ac_path_$1_found=false
-    # Loop through the user's path and test for each of PROGNAME-LIST
-    _AS_PATH_WALK([$5],
-    [for ac_prog in $2; do
-      for ac_exec_ext in '' $ac_executable_extensions; do
-        ac_path_$1="$as_dir/$ac_prog$ac_exec_ext"
-        AS_EXECUTABLE_P(["$ac_path_$1"]) || continue
-  $3
-        $ac_path_$1_found && break 3
-      done
-    done])dnl
-    if test -z "$ac_cv_path_$1"; then
-      m4_default([$4],
-        [AC_MSG_ERROR([no acceptable m4_bpatsubst([$2], [ .*]) could be dnl
-  found in m4_default([$5], [\$PATH])])])
-    fi
-  else
-    ac_cv_path_$1=$$1
-  fi
-  ]))
-