Upgrade from 1.11.6 to 1.11.7.
Upgrade njs module from 8c01042 to f8c642a.

<ChangeLog>

*) Change: now in case of a client certificate verification error the

$ssl_client_verify variable contains a string with the failure
reason, for example, "FAILED:certificate has expired".

*) Feature: the $ssl_ciphers, $ssl_curves, $ssl_client_v_start,

$ssl_client_v_end, and $ssl_client_v_remain variables.

*) Feature: the "volatile" parameter of the "map" directive.

*) Bugfix: dependencies specified for a module were ignored while

building dynamic modules.

*) Bugfix: when using HTTP/2 and the "limit_req" or "auth_request"

directives client request body might be corrupted; the bug had
appeared in 1.11.0.

*) Bugfix: a segmentation fault might occur in a worker process when

using HTTP/2; the bug had appeared in 1.11.3.

*) Bugfix: in the ngx_http_mp4_module.

Thanks to Congcong Hu.

*) Bugfix: in the ngx_http_perl_module.

</ChangeLog>