Remove some unused options from 10-main.conf

The options RC4_CHUNK_LL, DES_PTR, and BF_PTR were removed by Rich
in commit 3e9e810f

 but were still
sticking around in a coupule configuration entries.

Since they're unused, remove them.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1390)