scripts: ignore const struct checks
scripts: ignore const struct checks

checkpatch raise some false positives when run outside of the kernel tree.

The script checkpatch.pl from the kernel checks a list
of structs known to be const.
It is obviously not relevant as DPDK has not such list.

Signed-off-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk