[gtk/wip/baedert/test-cflags] demos/widget-factory: Add common_cflags to build

[Timm Bäder <baedert src gnome org>]

commit 3c28f6d8917908b125c63c97ab2a0d25f7d552a3
Author: Timm Bäder <mail baedert org>
Date:   Fri Mar 6 18:56:40 2020 +0100

    demos/widget-factory: Add common_cflags to build
    
    And fix the generated warnings

 demos/widget-factory/meson.build      | 1 +
 demos/widget-factory/widget-factory.c | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/demos/widget-factory/meson.build b/demos/widget-factory/meson.build
index 1c43423757..26e64db27b 100644
--- a/demos/widget-factory/meson.build
+++ b/demos/widget-factory/meson.build
@@ -6,6 +6,7 @@ widgetfactory_resources = gnome.compile_resources('widgetfactory_resources',
 
 executable('gtk4-widget-factory',
            'widget-factory.c', widgetfactory_resources,
+           c_args: common_cflags,
            dependencies: libgtk_dep,
            include_directories: confinc,
            gui_app: true,
diff --git a/demos/widget-factory/widget-factory.c b/demos/widget-factory/widget-factory.c
index 3883df63a8..2445af7c27 100644
--- a/demos/widget-factory/widget-factory.c
+++ b/demos/widget-factory/widget-factory.c
@@ -1075,6 +1075,7 @@ typedef struct
 
 typedef GtkTextViewClass MyTextViewClass;
 
+static GType my_text_view_get_type (void);
 G_DEFINE_TYPE (MyTextView, my_text_view, GTK_TYPE_TEXT_VIEW)
 
 static void
@@ -1446,6 +1447,7 @@ struct _GTestPermissionClass
   GPermissionClass parent_class;
 };
 
+static GType g_test_permission_get_type (void);
 G_DEFINE_TYPE (GTestPermission, g_test_permission, G_TYPE_PERMISSION)
 
 static void
@@ -1484,7 +1486,7 @@ acquire_async (GPermission         *permission,
   g_object_unref (task);
 }
 
-gboolean
+static gboolean
 acquire_finish (GPermission   *permission,
                 GAsyncResult  *res,
                 GError       **error)
@@ -1513,7 +1515,7 @@ release_async (GPermission         *permission,
   g_object_unref (task);
 }
 
-gboolean
+static gboolean
 release_finish (GPermission   *permission,
                 GAsyncResult  *result,
                 GError       **error)