[gegl] build: fix luajit detection

[Øyvind Kolås <ok src gnome org>]

commit bc0dc5650ef10b745bc32b0adf115d78471b896c
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Mar 26 21:31:08 2016 +0100

    build: fix luajit detection

 configure.ac |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f925644..e13b5c6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1008,7 +1008,8 @@ PKG_CHECK_MODULES(LUA, lua >= lua_required_version,
   [PKG_CHECK_MODULES(LUA, lua5.1 >= lua_required_version,
      have_lua="yes",
      [PKG_CHECK_MODULES(LUA, luajit >= 2.0.4,
-     have_lua="no  (usable lua not found)")])])
+      have_lua="yes (luajit)",
+      have_lua="no  (usable lua not found)")])])
 fi
 
 AM_CONDITIONAL(HAVE_LUA, test "$have_lua" = "yes")