[gimp] Fix typo in configure warning re: luajit

[Tobias <et src gnome org>]

commit 583d9657731d92ddf604df2478b098f49290ba47
Author: Tobias Ellinghaus <me houz org>
Date:   Tue Aug 20 14:02:43 2019 +0200

    Fix typo in configure warning re: luajit

 configure.ac | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 1ac9c4e40c..dd6dc3c655 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2381,9 +2381,9 @@ elif test "x$with_lua" = xforce; then
   AC_CHECK_PROGS(LUA, luajit, no)
   if test "x$LUA" = xno; then
     warning_lua="
-WARNING: luagit not found.
+WARNING: luajit not found.
          Lua plug-ins will be installed anyway but you should make
-         sure that luagit and LGI are available at installation,
+         sure that luajit and LGI are available at installation,
          otherwise installed plug-ins won't be usable."
     with_lua="yes (see warning below)"
   fi
@@ -2392,8 +2392,8 @@ else
   AC_CHECK_PROGS(LUA, luajit, no)
   if test "x$GJS" = xno; then
     required_deps="$required_deps
-    - luagit not found.
-        *** Please install the Lua interpreter luagit.
+    - luajit not found.
+        *** Please install the Lua interpreter luajit.
         *** Note that you may install the Lua plug-ins even if luajit
         *** is not installed at build-time by passing the configure
         *** option --with-lua=force.