use strtonum from libc (Kamil Rytarowski)

Enable WARNS=4 by default for usr.bin, except for:
awk bdes checknr compile_et error gss hxtool kgetcred kinit
klist ldd less lex locale login m4 man menuc mk_cmds
mklocale msgc

Enable WARNS=4 by default for usr.bin, except for:
awk bdes checknr compile_et error gss hxtool kgetcred kinit
klist ldd less lex locale login m4 man menuc mk_cmds
mklocale msgc openssl rpcgen rpcinfo sdiff spell ssh
string2key telnet tn3270 verify_krb5_conf xlint

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PR/34630: GNU sdiff(1) replacement
Import new sdiff(1). Compatible with GNU sdiff(1), has various bugfixes
and licensed in public domain.

christos@: "I am ok with it"
No objections in tech-userlevel@