[PATCH 1 of 1] CONF: make ssl_client_certificate optional with only tlsv1_3

[Praveen Chaudhary]

Hi Nginx Devs

This is my first Nginx patch. So guide me, if mistakes are made while
following the process.

*Testing done:*
Ran nginx-tests. Got the same results with or without patch.

*PATCH description* is in commit logs.

*Code doubts:*
Currently I used [~NGX_SSL_TLSv1_3] to find if configured protocols have
any other value than TLSv1.3.
Another way to do the same is:
[NGX_CONF_BITMASK_SET|NGX_SSL_TLSv1|NGX_SSL_TLSv1_1|NGX_SSL_TLSv1_2].
Kindly let me know which way is more prefered.
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