Fixing a deprecation, replacing __attribute__((packed)) with __packed.
It was deprecated for portability, specifically to avoid GCC specific
code.  See commit 82ddcb04.
Signed-off-by: NAugust Lilleaas <august@augustl.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (added include compiler.h)