autoconf: maint: post-release administrivia

https://github.com/libsdl-org/autoconf/commit/7ddb7888aef82d09f13014160ad16cffb46c8dc5

From 7ddb7888aef82d09f13014160ad16cffb46c8dc5 Mon Sep 17 00:00:00 2001
From: Zack Weinberg <[EMAIL REDACTED]>
Date: Thu, 28 Jan 2021 16:29:02 -0500
Subject: [PATCH] maint: post-release administrivia

* NEWS: Add header line for next release.
* .prev-version: Record previous version.
* cfg.mk (old_NEWS_hash): Auto-update.
---
 .prev-version | 2 +-
 NEWS          | 3 +++
 cfg.mk        | 2 +-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/.prev-version b/.prev-version
index 587cb39c..b93b4f20 100644
--- a/.prev-version
+++ b/.prev-version
@@ -1 +1 @@
-2.70
+2.71
diff --git a/NEWS b/NEWS
index f035e65e..8d921cc8 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,8 @@
 GNU Autoconf NEWS - User visible changes.
 
+* Noteworthy changes in release ?.? (????-??-??) [?]
+
+
 * Noteworthy changes in release 2.71 (2021-01-28) [stable]
 
 ** Bug fixes, including:
diff --git a/cfg.mk b/cfg.mk
index ce6edfdb..0d4ec728 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -84,7 +84,7 @@ update-release-year:
 .PHONY: update-release-year
 
 # Prevent incorrect NEWS edits.
-old_NEWS_hash = 152f03614545887231fddaf67821b4d4
+old_NEWS_hash = 981169afdd2c97642125938f80a26b7f
 
 exclude_file_name_regexp--sc_prohibit_undesirable_word_seq = \
   ^(maint\.mk|build-aux/texinfo\.tex)$$