[gupnp-igd] build: add support for automake-1.13

[Olivier Crête <Tester src gnome org>]

commit c4998d07d4420590d31457e728069def4a7035c9
Author: Nuno Araujo <nuno araujo russo79 com>
Date:   Sat Jan 19 00:22:52 2013 +0100

    build: add support for automake-1.13
    
    In Automake 1.13, the long-deprecated macro AM_CONFIG_HEADER (deprecated
    since 2002) has been removed in favour of AC_CONFIG_HEADERS.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3178e84..3f0cd84 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@ AC_PREREQ(2.53)
 AC_INIT(gupnp-igd, 0.2.2, http://www.gupnp.org/)
 AM_INIT_AUTOMAKE()
 AC_CONFIG_SRCDIR(libgupnp-igd/gupnp-simple-igd.h)
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS(config.h)
 AC_CONFIG_MACRO_DIR([m4])
 
 AC_ISC_POSIX