gst1-imx: bump version to 0.13.0

Changelog:

==== version 0.13.0 (2017-11-01) ====

* New imxv4l2videosink element
  Currently only supports input physically contiguous memory blocks
  as input (so, for example, no videotestsrc)

* New Pango-based overlay elements using G2D for rendering

* gstimxcommon library is now public
  Necessary when implementing external sinks to retrieve the mapped
  physical memory address from gstreamer buffers
  (NOTE: ABI may change in the next few releases until this is stabilized)

* New optional ability to use GstPhysMemory from gst-plugins-bad

* imxv4l2videosrc:
  * Fix compile prior to Gstreamer 1.3.1
  * v4l2_buffer_pool: Add special case for tw6869 driver
    The tw6869 driver requires a different physical address to allow
    DMA'able buffers for decreasing latency between chip and display
  * v4l2src: add fractional "fps" property
    (obsoletes the "fps-n" property)
  * Add GstImxV4l2Meta init function
    This avoids the g_assert() that was caused by the missing init
    function
  * Add num-additional-buffers property
    This can be useful if capturing video isn't smooth; it sets the
    number of internal additional buffers, so if downstream consumes
    too many buffers, imxv4l2videosrc might end up doing a blocking
    wait until buffers are returned

* imxv4l2src plugin is now called imxv4l2video, because it also
  contains imxv4l2videosink
  Also, the v4l2 elements can be enabled/disabled in the build
  configuration individually now

* compositor:
  * Only copy compositor input buffers to DMA memory once
    If a single input frame is used for multiple output frames, we would
    otherwise copy multiple times which can easily go to the limit of the
    memory bandwidth

* vpu:
  * Handle releasing of buffers without assigned framebuffer
    This can happen if the buffer is released before it was actually
    used, e.g. when renegotiating at the very beginning; prevents
    a crash that would otherwise occur
  * Add parameter check to avoid encoder crash on flush

* g2d:
  * Add build configuration switches to explicitely specify G2D include
    and library paths
  * Disable cacheable memory allocation
    Several issues were reported with cacheable DMA memory, so it is
    turned off, at least for now

* blitter:
  * Add property to clear screen to black in blitter sinks
  * Add output-rotation property to videotransform base class

* audio:
  * Fix reference counting for caps
  * Mark static codec caps as may be leaked
    This gets rid of the false positive in the leak tracer

Signed-off-by: Alexandre Esse <alexandre.esse.dev@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

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