[at-spi2-core] Fix typo that broke the build in mysterious ways for me.

[Kjartan Maraas <kmaraas src gnome org>]

commit 0db419599a9f2909529ce0de938fde87620a3d3a
Author: Kjartan Maraas <kmaraas gnome org>
Date:   Sun Sep 5 17:12:22 2010 +0200

    Fix typo that broke the build in mysterious ways for me.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f633ad5..6ea4635 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,7 +26,7 @@ AC_PROG_CC
 LT_INIT([disable-static])
 PKG_PROG_PKG_CONFIG
 
-AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_HEADER([config.h])
 
 PKG_CHECK_MODULES(DBUS, [dbus-1 >= 1.0])
 AC_SUBST(DBUS_LIBS)