[planner] Update deprecated macros

[Alexandre Franke <afranke src gnome org>]

commit c8babf6cebb9f24d60a244048217c4d7c342e085
Author: Alexandre Franke <alexandre franke gmail com>
Date:   Wed Apr 19 18:18:26 2017 +0200

    Update deprecated macros

 configure.ac |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 1320b16..4dcd7b8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,8 +2,9 @@
 # require autoconf 2.54
 AC_PREREQ(2.54)
 
-AC_INIT(AUTHORS)
-AM_INIT_AUTOMAKE(planner, 0.14.6)
+AC_INIT([planner], 0.14.6)
+AC_CONFIG_SRCDIR(AUTHORS)
+AM_INIT_AUTOMAKE
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 AC_CONFIG_HEADERS(config.h)