[gnome-commander/ConvertWarningsToErrors] src/gnome-cmd-file-list.cc: fix for -Wmissing-declarations

[Uwe Scholz <uwescholz src gnome org>]

commit 0efee7895ac1e2b54e7897ec4aaa30ad142f6cf8
Author: Mamoru TASAKA <mtasaka fedoraproject org>
Date:   Sun Apr 23 12:58:04 2017 +0900

    src/gnome-cmd-file-list.cc: fix for -Wmissing-declarations
    
    src/gnome-cmd-file-list.cc:2839:6: error: no previous declaration for 'void free_dnd_popup_data(void**)' 
[-Werror=missing-declarations]
     void free_dnd_popup_data (gpointer *data)
      - This function does not appear on any headers

 src/gnome-cmd-file-list.cc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gnome-cmd-file-list.cc b/src/gnome-cmd-file-list.cc
index 56f8592..18b7153 100644
--- a/src/gnome-cmd-file-list.cc
+++ b/src/gnome-cmd-file-list.cc
@@ -2836,7 +2836,7 @@ static void unref_uri_list (GList *list)
 }
 
 
-void free_dnd_popup_data (gpointer *data)
+static void free_dnd_popup_data (gpointer *data)
 {
     if (data)
     {