Remove deprecated warnings on Gtk
A lot of deprecated Gtk functions :
/Users/laurent/miniconda3/envs/openvibe/include/gtk-2.0/gtk/gtktypeutils.h:236:34: warning: 'GTypeDebugFlags' is deprecated [-Wdeprecated-declarations] void gtk_type_init (GTypeDebugFlags debug_flags); ^ /Users/laurent/miniconda3/envs/openvibe/include/glib-2.0/gobject/gtype.h:729:19: note: 'GTypeDebugFlags' has been explicitly marked deprecated here } GTypeDebugFlags GOBJECT_DEPRECATED_TYPE_IN_2_36; ^ /Users/laurent/miniconda3/envs/openvibe/include/glib-2.0/gobject/gobject-visibility.h:213:41: note: expanded from macro 'GOBJECT_DEPRECATED_TYPE_IN_2_36' #define GOBJECT_DEPRECATED_TYPE_IN_2_36 GLIB_DEPRECATED_TYPE ^ /Users/laurent/miniconda3/envs/openvibe/include/glib-2.0/glib/gmacros.h:1323:30: note: expanded from macro 'GLIB_DEPRECATED_TYPE' #define GLIB_DEPRECATED_TYPE G_DEPRECATED ^ /Users/laurent/miniconda3/envs/openvibe/include/glib-2.0/glib/gmacros.h:1262:37: note: expanded from macro 'G_DEPRECATED' #define G_DEPRECATED __attribute__((__deprecated__)) ^ I