Fix build warnings
About GObject introspection I don't know if something could or should be done for xfce-i18n.h
:
GISCAN Libxfce4util-1.0.gir
xfce-i18n.h:59: Warning: Libxfce4util: symbol='gettext': Unknown namespace for symbol 'gettext'
xfce-i18n.h:60: Warning: Libxfce4util: symbol='dgettext': Unknown namespace for symbol 'dgettext'
xfce-i18n.h:61: Warning: Libxfce4util: symbol='dcgettext': Unknown namespace for symbol 'dcgettext'
xfce-i18n.h:62: Warning: Libxfce4util: symbol='ngettext': Unknown namespace for symbol 'ngettext'
xfce-i18n.h:63: Warning: Libxfce4util: symbol='dngettext': Unknown namespace for symbol 'dngettext'
xfce-i18n.h:64: Warning: Libxfce4util: symbol='dcngettext': Unknown namespace for symbol 'dcngettext'
EDIT: those warnings are fixed in !23 (merged).
Edited by Gaël Bonithon