[NetworkManager-fortisslvpn/lr/no-libnm-glib: 1/5] build: deal with the autoconf warnings

[Lubomir Rintel <lkundrak src gnome org>]

commit d04f8fcb96bcbe17ea0c970f82d4f54492de67d6
Author: Lubomir Rintel <lkundrak v3 sk>
Date:   Mon Jun 27 16:21:01 2022 +0200

    build: deal with the autoconf warnings
    
    This modernizes configure.ac a bit, so that autoconf doesn't complain.
    No functional changes.

 configure.ac | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a998707..f103cca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,16 +12,17 @@ AC_USE_SYSTEM_EXTENSIONS
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([config.h])
 
+AC_USE_SYSTEM_EXTENSIONS
+
 dnl
 dnl Require programs
 dnl
 AC_PROG_CC
 AM_PROG_CC_C_O
 AC_PROG_INSTALL
-AC_PROG_LIBTOOL
+LT_INIT([disable-static])
 AC_PATH_PROG(GLIB_COMPILE_RESOURCES, glib-compile-resources)
 
-AC_GNU_SOURCE
 
 AC_CHECK_PROG([has_file], file, yes, no)
 if test x$has_file = xno ; then
@@ -36,7 +37,6 @@ fi
 dnl
 dnl Required headers
 dnl
-AC_HEADER_STDC
 AC_CHECK_HEADERS(fcntl.h paths.h sys/ioctl.h sys/time.h syslog.h unistd.h)
 
 AC_CHECK_HEADERS(pppd/pppd.h,,
@@ -56,7 +56,6 @@ dnl Checks for typedefs, structures, and compiler characteristics.
 dnl
 AC_TYPE_MODE_T
 AC_TYPE_PID_T
-AC_HEADER_TIME
 
 dnl
 dnl Checks for library functions.