pifmrds: add patch to correct linking in static build

This patch fixes an autobuild error during a static build:
http://autobuild.buildroot.net/results/f61ae46ba4d4fc3af3784d1f612a8c1cc7de3314/



Signed-off-by: Eric Limpens <limpens@gmail.com>
[Arnout: clean up commit message and patch log]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>