[java-atk-wrapper/wip] Build: fix missing AC_PATH_X warning

[Magdalen Berns <mberns src gnome org>]

commit 0b4386d50fd724f3e84238d769e0162c5ffb01ad
Author: Magdalen Berns <m berns thismagpie com>
Date:   Wed Jul 1 02:09:07 2015 +0100

    Build: fix missing AC_PATH_X warning
    
    Bug: https://bugzilla.gnome.org/show_bug.cgi?id=751760

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 02d7f9e..03f899c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,6 +25,7 @@ AC_CONFIG_HEADERS([config.h])
 AC_PROG_CC(gcc)
 AC_PROG_INSTALL
 AC_ISC_POSIX
+AC_PATH_XTRA
 
 # Initialize libtool
 LT_PREREQ([2.2.6])