libsigsegv: fix patch failure of 0004-Add-stack...

After removing the patch 0001-Add-stack... in commit
9863553f "packages: all salute the
passing of avr32" the patch 004-Add-stack... does not apply anymore, so
fix it.

Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>