[gimp] libgimpbase: remove case of plug-ins binaries directly under plug-ins/.

[Jehan <jehanp src gnome org>]

commit 58b98b941ffc3a05bcb8c9ff6f2cb3ce6b846d4a
Author: Jehan <jehan girinstud io>
Date:   Tue Jan 19 11:40:00 2021 +0100

    libgimpbase: remove case of plug-ins binaries directly under plug-ins/.
    
    In GIMP 3, plug-ins are mandatorily under a subdirectory. Though on GIMP
    2.10.x, both cases are still possible. So only the previous commit
    should be backported to gimp-2-10 branch.
    
    See discussion in !392.
    Thanks also to Christopher Nielsen for helping.

 libgimpbase/gimpenv.c | 12 ------------
 1 file changed, 12 deletions(-)
---
diff --git a/libgimpbase/gimpenv.c b/libgimpbase/gimpenv.c
index 720dab3cf6..5a12462d94 100644
--- a/libgimpbase/gimpenv.c
+++ b/libgimpbase/gimpenv.c
@@ -422,18 +422,6 @@ gimp_installation_directory (void)
 
         toplevel = g_strdup (dirname);
       }
-    else if (! strcmp (basename, "plug-ins"))
-      {
-        /*  same for plug-ins, go three levels up from prefix/lib/gimp/x.y  */
-
-        gchar *tmp  = g_path_get_dirname (dirname);
-        gchar *tmp2 = g_path_get_dirname (tmp);
-
-        toplevel = g_path_get_dirname (tmp2);
-
-        g_free (tmp);
-        g_free (tmp2);
-      }
     else if (! strcmp (g_path_get_basename (dirname), "plug-ins"))
       {
         /*  same for plug-ins in subdirectory, go three levels up from prefix/lib/gimp/x.y  */