Improve error message for PRNG seeding failure

In prng_fortuna.c, if krb5_c_random_make_octets detects that we do not
have entropy, set an error message saying that the random number
generator could not be seeded, as we likely failed previously to read
from /dev/urandom or the Windows equivalent.

ticket: 7968 (new)
Remove copyright statement added to bindresvport.c

Andreas's copyright statement was added to the Oracle license
statement by mistake; the code changes made to turn bindresvport into
bindresvport_sa are minimal.  Remove it with Andreas's permission.

ticket: 7935