atoi: remove atoi usage

docs/examples/chkspeed.c

lib/cookie.c

lib/ftp.c

lib/ldap.c

lib/smtp.c

lib/url.c

src/main.c

tests/libtest/first.c

tests/libtest/lib521.c

tests/libtest/lib562.c

tests/server/rtspd.c

tests/server/sws.c