gst-fsl-plugins: Refresh one patch to fix build

This fixes the following patch application error when building for i.MX6:

  Applying gst-fsl-plugins-0004-Fix-libgstfsl-linkage-add-lrt-for-shared-memory-func.patch using patch:
  patching file configure.ac
  Hunk #1 succeeded at 178 with fuzz 2 (offset 5 lines).
  patching file libs/Makefile.am
  Hunk #1 FAILED at 12.
  1 out of 1 hunk FAILED -- saving rejects to file libs/Makefile.am.rej
  Patch failed!  Please fix gst-fsl-plugins-0004-Fix-libgstfsl-linkage-add-lrt-for-shared-memory-func.patch!

Signed-off-by: Vincent Stehlé <vincent.stehle@freescale.com>
Cc: Peter Seiderer <ps.report@gmx.net>
Cc: Eric Nelson <eric.nelson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>