[hitori] build: Add missing AC_CHECK_FUNCS call for atexit()

[Philip Withnall <pwithnall src gnome org>]

commit b41f0fe353cbe6825fdeffca8870e51a1a69dc0e
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Wed Mar 11 12:23:00 2015 +0000

    build: Add missing AC_CHECK_FUNCS call for atexit()
    
    The generated GResource code uses it. Spotted by autoscan. Thanks,
    autoscan!

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c84fbcb..a17d13f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,6 +40,7 @@ YELP_HELP_INIT
 APPSTREAM_XML
 
 # Dependencies
+AC_CHECK_FUNCS([atexit])
 PKG_CHECK_MODULES([GENERAL],[glib-2.0 gio-2.0 >= 2.32 gtk+-3.0 >= 3.15.0 gmodule-2.0 cairo >= 1.4])
 
 # Output!