Replace macros deprecated in automake-1.13; fixed upstream in glib-2.36

diff --git a/configure.in b/configure.in
index e94cc77..d88d834 100644
--- a/configure.in
+++ b/configure.in
@@ -60,7 +60,7 @@ PACKAGE=glib
 AM_INIT_AUTOMAKE($PACKAGE, $VERSION, no-define)
 
 # Specify a configuration file
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS(config.h)
 
 AC_DEFINE_UNQUOTED(GLIB_MAJOR_VERSION, $GLIB_MAJOR_VERSION)
 AC_DEFINE_UNQUOTED(GLIB_MINOR_VERSION, $GLIB_MINOR_VERSION)
@@ -151,7 +151,6 @@ AC_DEFINE_UNQUOTED(G_COMPILED_WITH_DEBUGGING, "${enable_debug}")
 
 # Checks for programs.
 AC_PROG_CC
-AM_PROG_CC_STDC
 AC_PROG_INSTALL
 
 changequote(,)dnl