gstreamer1.0-plugins-bad: upgrade to version 1.12.2

gstreamer1.0-plugins-bad: upgrade to version 1.12.2

* Remove backported patches:
  1. 0001-smoothstreaming-implement-adaptivedemux-s-get_live_s.patch
  2. 0001-smoothstreaming-use-the-duration-from-the-list-of-fr.patch
  3. 0001-mssdemux-improved-live-playback-support.patch

* Refreshed the following patches:
  1. 0001-Makefile.am-don-t-hardcode-libtool-name-when-running.patch
     Extended patch to include fix for libgstallocators
  2. 0001-Prepend-PKG_CONFIG_SYSROOT_DIR-to-pkg-config-output.patch
     Updated to apply to 1.12.2
  3. gstreamer-gl.pc.in-don-t-append-GL_CFLAGS-to-CFLAGS.patch
     Updated to apply to 1.12.2

* Removed license checks in tta directory as it doesn't exist anymore.

* In 1.12.0, old unsupported plugins were removed. As a result, the
  list of unsupported plugins was removed.

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>