config: replace deprecated AM_CONFIG_HEADER with AC_CONFIG_HEADERS

This silences an Autoconf warning

diff --git a/configure.ac b/configure.ac
index 27b4ece..2ab8a6d 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -33,7 +33,7 @@ m4_ifndef([XORG_MACROS_VERSION],
 XORG_MACROS_VERSION(1.8)
 XORG_DEFAULT_OPTIONS
 
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS([config.h])
 
 # Checks for pkg-config packages
 PKG_CHECK_MODULES(XDPYINFO, xext x11 xtst x11-xcb xcb)