gtk3 gtkunixprint.h compile problems (it and other headers)

[Jeff Johnson]

Need a placeholder bug for these, there's a whole lot wrong with the printing
import so far. A few have been fixed. The first batch to be tracked here
are functions listed as "undeclared" when compiling against the header
(gtk-3.0/gtk/gtkunixprint.h)

gtk_enumerate_printers
gtk_page_setup_unix_dialog_get_page_setup
gtk_page_setup_unix_dialog_get_print_settings
gtk_page_setup_unix_dialog_set_page_setup
gtk_page_setup_unix_dialog_set_print_settings
gtk_printer_accepts_pdf
gtk_printer_accepts_ps
gtk_printer_compare
gtk_printer_get_backend
gtk_printer_get_capabilities
gtk_printer_get_default_page_size
gtk_printer_get_description
gtk_printer_get_hard_margins
gtk_printer_get_icon_name
gtk_printer_get_job_count
gtk_printer_get_location
gtk_printer_get_name
gtk_printer_get_state_message
gtk_printer_has_details
gtk_printer_is_accepting_jobs
gtk_printer_is_active
gtk_printer_is_default
gtk_printer_is_paused
gtk_printer_is_virtual
gtk_printer_list_papers
gtk_printer_new
gtk_printer_request_details

And types:
GtkPageSetupUnixDialog
GtkPrintBackend
GtkPrintCapabilities
GtkPrinter
GtkPrinterFunc

(usually the Gtk *Func ones are FuncPtr types that blow up because one
of the types referenced does not exist)