Looking at this driver history, there was never a need for including
execinfo.h.
Fixes: bdbf45c24b07 ("net/nfp: fix build with musl libc")
Cc: stable@dpdk.org
Signed-off-by: David Marchand <david.marchand@redhat.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@corigine.com>