[gnome-commander/ConvertWarningsToErrors] Adds static keyword to remove gcc warnings about missing declarations

[Uwe Scholz <uwescholz src gnome org>]

commit 36f8bfc7a8b6e02779fd8221d97fa6fdf5dbbc8a
Author: Uwe Scholz <uwescholz src gnome org>
Date:   Fri Apr 28 23:11:07 2017 +0200

    Adds static keyword to remove gcc warnings about missing declarations

 src/dialogs/gnome-cmd-file-props-dialog.cc |    4 ++--
 src/dialogs/gnome-cmd-options-dialog.cc    |   12 ++++++------
 2 files changed, 8 insertions(+), 8 deletions(-)
---
diff --git a/src/dialogs/gnome-cmd-file-props-dialog.cc b/src/dialogs/gnome-cmd-file-props-dialog.cc
index 55bbf1b..2e49d5d 100644
--- a/src/dialogs/gnome-cmd-file-props-dialog.cc
+++ b/src/dialogs/gnome-cmd-file-props-dialog.cc
@@ -286,7 +286,7 @@ inline void add_sep (GtkWidget *table, gint y)
 }
 
 
-void add_tag (GtkWidget *dialog, GtkWidget *table, gint &y, GnomeCmdFileMetadata &metadata, GnomeCmdTag tag, 
const gchar *appended_text=NULL)
+static void add_tag (GtkWidget *dialog, GtkWidget *table, gint &y, GnomeCmdFileMetadata &metadata, 
GnomeCmdTag tag, const gchar *appended_text=NULL)
 {
     if (!metadata.has_tag (tag))
         return;
@@ -328,7 +328,7 @@ inline void add_width_height_tag (GtkWidget *dialog, GtkWidget *table, gint &y,
 }
 
 
-GtkWidget *create_properties_tab (GnomeCmdFilePropsDialogPrivate *data)
+static GtkWidget *create_properties_tab (GnomeCmdFilePropsDialogPrivate *data)
 {
     gint y = 0;
     GtkWidget *dialog = data->dialog;
diff --git a/src/dialogs/gnome-cmd-options-dialog.cc b/src/dialogs/gnome-cmd-options-dialog.cc
index 2a32893..7177898 100644
--- a/src/dialogs/gnome-cmd-options-dialog.cc
+++ b/src/dialogs/gnome-cmd-options-dialog.cc
@@ -65,7 +65,7 @@ static void on_confirm_delete_toggled (GtkToggleButton *togglebutton, GtkWidget
  *
  **********************************************************************/
 
-GtkWidget *create_general_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
+static GtkWidget *create_general_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
 {
     GtkWidget *frame, *hbox, *vbox, *cat, *cat_box;
     GtkWidget *radio, *check;
@@ -285,7 +285,7 @@ static void on_date_format_update (GtkEditable *editable, GtkWidget *options_dia
 }
 
 
-GtkWidget *create_format_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
+static GtkWidget *create_format_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
 {
     GtkWidget *frame, *hbox, *scrolled_window, *vbox, *cat, *cat_box, *table;
     GtkWidget *radio, *label, *entry;
@@ -692,7 +692,7 @@ static void on_ls_colors_edit (GtkButton *btn, GtkWidget *parent)
 }
 
 
-GtkWidget *create_layout_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
+static GtkWidget *create_layout_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
 {
     GtkWidget *frame, *hbox, *scrolled_window, *vbox, *cat;
     GtkWidget *entry, *spin, *scale, *table, *label, *fpicker, *btn;
@@ -942,7 +942,7 @@ inline void store_tabs_options (GtkWidget *dialog, GnomeCmdData::Options &cfg)
  *
  **********************************************************************/
 
-GtkWidget *create_confirmation_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
+static GtkWidget *create_confirmation_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
 {
     GtkWidget *frame, *hbox, *scrolled_window, *vbox, *cat, *cat_box;
     GtkWidget *radio, *check;
@@ -1554,7 +1554,7 @@ static void on_app_move_down (GtkWidget *button, GtkWidget *frame)
 }
 
 
-GtkWidget *create_programs_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
+static GtkWidget *create_programs_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
 {
     GtkWidget *frame, *hbox, *scrolled_window, *vbox, *cat, *table1, *table2;
     GtkWidget *entry, *button, *label, *clist, *bbox, *check;
@@ -1939,7 +1939,7 @@ static void on_device_move_down (GtkWidget *button, GtkWidget *frame)
 }
 
 
-GtkWidget *create_devices_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
+static GtkWidget *create_devices_tab (GtkWidget *parent, GnomeCmdData::Options &cfg)
 {
     GtkWidget *frame, *hbox, *scrolled_window, *vbox, *cat, *cat_box;
     GtkWidget *button, *clist, *bbox, *check;