[gnome-commander] Modernize configure.ac via autoupdate

[Uwe Scholz <uwescholz src gnome org>]

commit 053a29378f71553f84245ad51d103c095bc9f428
Author: Uwe Scholz <uwescholz src gnome org>
Date:   Wed Feb 8 22:04:41 2017 +0100

    Modernize configure.ac via autoupdate

 configure.ac |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index af29346..e105e9f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT(gnome-commander, 1.7.0, http://bugzilla.gnome.org/enter_bug.cgi?product=gnome-commander)
+AC_INIT([gnome-commander],[1.7.0],[http://bugzilla.gnome.org/enter_bug.cgi?product=gnome-commander])
 AC_CONFIG_SRCDIR(src/gnome-cmd-includes.h)
 AC_CONFIG_MACRO_DIR([m4])
 
@@ -9,7 +9,7 @@ YELP_HELP_INIT
 AM_MAINTAINER_MODE
 AM_CONFIG_HEADER(config.h)
 
-AC_GNU_SOURCE
+AC_USE_SYSTEM_EXTENSIONS
 
 GLIB_GSETTINGS
 
@@ -461,7 +461,7 @@ dnl =====================
 dnl Write some output
 dnl =====================
 
-AC_OUTPUT([
+AC_CONFIG_FILES([
 Makefile
 data/gnome-commander.ebuild
 data/gnome-commander.spec
@@ -488,6 +488,7 @@ src/intviewer/Makefile
 tests/Makefile
 README
 ])
+AC_OUTPUT