Remove extra `s' from error messages

The error message for both --with-hash and --with-random in configure
spell option with an extra s. Remove the extra s from the error
messages.

Signed-off-by: Marcus Karlsson <mk@acc.umu.se>
Use `or' in the --with-random error message

The error message to --with-random in configure does not have an `or'
between the last two items. This is inconsistent with the --with-hash
option and looks somewhat bad. Remove the last comma sign and instead
insert an or there.

Signed-off-by: Marcus Karlsson <mk@acc.umu.se>