autoconf: add patch to workaround m4 issue on arm

Should be fixed properly in m4 though. Reported in
https://github.com/termux/termux-packages/issues/7361.

packages/autoconf/autom4te.in.patch

@@ -0,0 +1,11 @@
+--- ./bin/autom4te.in.orig	2021-08-19 21:45:43.203065990 +0200
++++ ./bin/autom4te.in	2021-08-19 21:46:46.779739045 +0200
+@@ -94,7 +94,7 @@
+ my $m4 = $ENV{"M4"} || '@M4@';
+ # Some non-GNU m4's don't reject the --help option, so give them /dev/null.
+ fatal "need GNU m4 1.4 or later: $m4"
+-  if system "$m4 --help </dev/null 2>&1 | grep reload-state >/dev/null";
++  if system "$m4 --help 2>&1 | grep reload-state >/dev/null";
+ 
+ # Set some high recursion limit as the default limit, 250, has already
+ # been hit with AC_OUTPUT.  Don't override the user's choice.

packages/autoconf/build.sh

@@ -3,6 +3,7 @@ TERMUX_PKG_DESCRIPTION="Creator of shell scripts to configure source code packag
 TERMUX_PKG_LICENSE="GPL-3.0"
 TERMUX_PKG_MAINTAINER="@termux"
 TERMUX_PKG_VERSION=2.71
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://mirrors.kernel.org/gnu/autoconf/autoconf-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_SHA256=f14c83cfebcc9427f2c3cea7258bd90df972d92eb26752da4ddad81c87a0faa4
 TERMUX_PKG_DEPENDS="m4, make, perl"