gstreamer1.0-plugins-base: upgrade to version 1.6.1

gstreamer1.0-plugins-base: upgrade to version 1.6.1

A number of patches had to be deleted in order for the recipe to work.

Patches which cannot be applied cleanly to 1.6.1 and are nontrivial to fix:
* 0001-basetextoverlay-make-memory-copy-when-video-buffer-s.patch
* handle-audio-video-decoder-error.patch
* taglist-not-send-to-down-stream-if-all-the-frame-cor.patch

Patches which were rejected by upstream:
* 0002-gstplaysink-don-t-set-async-of-custom-text-sink-to-f.patch

Patches which either were backports or accepted and integrated:
* 0001-video-frame-Don-t-ref-buffers-twice-when-mapping.patch
* 0002-video-frame-Add-GST_VIDEO_FRAME_MAP_FLAG_NO_REF.patch
* 0003-videofilter-Use-new-GST_VIDEO_FRAME_MAP_FLAG_NO_REF.patch
* do-not-change-eos-event-to-gap-event2.patch
* do-not-change-eos-event-to-gap-event3.patch
* do-not-change-eos-event-to-gap-event-if.patch
* fix-id3demux-utf16-to-utf8-issue.patch
* videobuffer_updata_alignment_update.patch
* videoencoder-Keep-sticky-events-around-when-doing-a-soft-.patch

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
Signed-off-by: Ross Burton <ross.burton@intel.com>