utils: updates .gitignore to include nfbpf_compile

Reported-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
extensions: libxt_bpf: clarify --bytecode argument

Mart Frauenlob suggested a change to explain the --bytecode
better. I have added some reference to the example bytecode
in the format that this argument accepts.

Reported-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
extensions: libxt_multiport: Update manpage to list valid protocols

This patch updates the list of valid protocols in the man page section
of the multiport match to: tcp, udp, udplite, dccp and sctp.

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>