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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from Edward Hervey <bilboed at bilboed.com> ---
Note that this commit does not solve the following problem:
* Thread 1 calls gst_pad_activate()
* Thread 2 was currently doing the (de)activation
* Thread 1 assumes pad (de)activation has happened and does something with it
while the (de)actvation hasn't *actually* completed.

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