libv4l: add patch to fix libjpeg build issue

Since the bump of libjpeg to v9b, libv4l doesn't build anymore due to
the change of the prototype of jpeg_mem_src(), which gets
re-implemented in libv4l when the libjpeg is too old.

Fixes:

  http://autobuild.buildroot.org/results/e7a/e7a2341cbbcf514f4cd6754a5a36cebd6556a757/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Tested-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>