Update to 2.34

2.33.13 (unstable):

Gio:
* AppLaunchContext: Add setenv(), unsetenv() and get_environment().
* File: Add remove_async() and remove_finish().
  (Murray Cumming)
* Add e ConverterInputStream and ConverterOutputStream.
* Add PollableInputStream and PollableOutputStream.
  (José Alburquerque)

Gio::DBus:
* Connection: Add the call_[finish|sync]() with UnixFDLists.
  (José Alburquerque)#662371.

gmmproc:
* Add a _NO_WRAP_INIT_REGISTRATION macro
  (José Alburquerque) Bug #684006
* _CLASS_GOBJECT: Allow classes to have custom wrap() functions.
  (José Alburquerque) Bug #684006
* _WRAP_METHOD: Allow setting parameters from C output params.
  (José Alburquerque) Bug #662371
* Prepend a Doxygen @throws clause to the declaration of virtual
  functions that throw Glib::Error.
  (José Alburquerque)
* Improve the search for unwrapped methods.
  (Kjell Ahlstedt)

Build:
* Use std::time_t instead of ::time_t
  instead of ::time_t.
* Use std::size_t and std::ptrdiff_t instead
  of ::size_t and ::ptrdiff_t.
  (Kjell Ahlstedt)