[gimp] app: fix signature of gimp_parallel_run_async() function template

[Ell <ell src gnome org>]

commit 00d034a1d407eb753517e4afe665a399c29cf3ae
Author: Ell <ell_se yahoo com>
Date:   Tue Jul 3 00:45:17 2018 -0400

    app: fix signature of gimp_parallel_run_async() function template
    
    Remove the now-useless "independent" parmaeter.  It is supplanted
    by the new gimp_parallel_run_async_independent() function.

 app/core/gimp-parallel.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/app/core/gimp-parallel.h b/app/core/gimp-parallel.h
index a796fb7783..57e2ec9eec 100644
--- a/app/core/gimp-parallel.h
+++ b/app/core/gimp-parallel.h
@@ -68,8 +68,7 @@ extern "C++"
 
 template <class ParallelRunAsyncFunc>
 inline GimpAsync *
-gimp_parallel_run_async (gboolean             independent,
-                         ParallelRunAsyncFunc func)
+gimp_parallel_run_async (ParallelRunAsyncFunc func)
 {
   ParallelRunAsyncFunc *func_copy = g_new (ParallelRunAsyncFunc, 1);