package/dvb-apps: re-add the patch for gcc < 4.4

The patch 0002-Fix-compiler-warning-flags.patch was
removed when the avr32 architecture was removed.
But it's still needed for blackfin adi-toolchain 2014R1.

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>