* krcp.c, krlogin.c, krlogind.c, krsh.c, krshd.c, login.c,

    * krcp.c, krlogin.c, krlogind.c, krsh.c, krshd.c, login.c,
        setenv.c, v4rcp.c: Signed v.s unsigned int cleanup.

        * defines.h: rcmd_stream_{read,write} take size_t as length argument.

        * kcmd.c: Use GETSOCKNAME_ARG3_TYPE instead of assuming int. input
        and output handler take size_t as length argument instead of
        int. Other signed vs. unsigned fixes.

        * configure.in: Add KRB5_GETSOCKNAME_ARGS.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@14050 dc483132-0cff-0310-8789-dd5450dbe970