[monitoring-plugins] configure.ac: Lower required Autoconf version

[Holger Weiss]

 Module: monitoring-plugins
 Branch: master
 Commit: 29396a397e18f368fc9ecad4a8e831dd6d75d46e
 Author: Holger Weiss <holger at zedat.fu-berlin.de>
   Date: Tue Dec 31 12:38:40 2024 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=29396a39

configure.ac: Lower required Autoconf version

Revert the bump to requiring Autoconf 2.71, as some of our CI images
don't offer that version yet.  Keep the remaining changes though, as
they should be compatible with Autoconf 2.64.

---

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 79b44c7b..ef3d26e2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-AC_PREREQ([2.71])
+AC_PREREQ([2.64])
 AC_INIT([monitoring-plugins],[2.4git])
 AC_CONFIG_SRCDIR(NPTest.pm)
 AC_CONFIG_FILES([gl/Makefile])