[gimp] app: fix unused variable warning in gimp_tool_gui_new()

[Ell <ell src gnome org>]

commit 7fb1d05ca4cea6a9c04e6ab7081cfe5e6a01f460
Author: Ell <ell_se yahoo com>
Date:   Thu Mar 7 16:44:32 2019 -0500

    app: fix unused variable warning in gimp_tool_gui_new()
    
    ... due to commit b23fae86f00c42e8ca2edcf7e480db88ca665aed.

 app/display/gimptoolgui.c | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/app/display/gimptoolgui.c b/app/display/gimptoolgui.c
index eb7b934e0b..bbe88e65f0 100644
--- a/app/display/gimptoolgui.c
+++ b/app/display/gimptoolgui.c
@@ -225,7 +225,6 @@ gimp_tool_gui_new (GimpToolInfo *tool_info,
   GimpToolGui        *gui;
   GimpToolGuiPrivate *private;
   va_list             args;
-  const gchar        *button_text;
 
   g_return_val_if_fail (GIMP_IS_TOOL_INFO (tool_info), NULL);