[Bug 790431] gstpad: Make calls to GstPadActivateFunction MT-safe

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790431

--- Comment #3 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 363816
  --> https://bugzilla.gnome.org/attachment.cgi?id=363816&action=edit
gstpad: Make pad (de)activation atomic

The following could happen previously:
* T1: calls gst_pad_set_active()
* T2: currently (de)activating it
* T1: gst_pad_set_active() returns, caller assumes that the pad has
  completed the requested (de)activation ... whereas it is not
  the case since the actual (de)activation in T2 might still be
  going on.

To ensure atomicity of pad (de)activation, we use a internal
variable (and cond) to ensure only one thread at a time goes through
the actual (de)activation block

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