[glib] (15 commits) ...Merge branch 'writev' into 'master'

[Philip Withnall <pwithnall src gnome org>]

Summary of changes:

  042b8dc... Introduce new GPollableReturn enum
  0bcc177... Add writev() / writev_all() API to GOutputStream and GPolla
  89da9eb... Change to g_warning() into assertions in GOutputStream
  c39264d... Implement GOutputStream::writev_fn() for GLocalFileOutputSt
  90d9e4a... Implement GOutputStream::writev() and GPollableOutputStream
  63ea8d1... Simplify some code in GUnixOutputStream
  f0a11b2... Add g_socket_send_message_with_timeout()
  cc7f2f6... Add (type GSocketMsgFlags) to int-typed flags parameters in
  9ae40d9... Rename timeout variables in gsocket.[ch] to include the uni
  e6f5a50... Implement GOutputStream::writev_fn() and GPollableOutputStr
  708aa8f... Add some tests for g_output_stream_writev() and its async v
  61520ae... Add test for async read/write(v)/close on GSocketConnection
  fe71a19... Add test for blocking read/write/writev on GSocket*Streams
  b94940d... Add test for blocking and non-blocking and async read/write
  791819c... Merge branch 'writev' into 'master'