Core: allow strings without null-termination in ngx_parse_url().
Core: allow strings without null-termination in ngx_parse_url().

This fixes buffer over-read while using variables in the "proxy_pass",
"fastcgi_pass", "scgi_pass", and "uwsgi_pass" directives, where result
of string evaluation isn't null-terminated.

Found with MemorySanitizer.

Signed-off-by: Piotr Sikora <ba6f3a1a6d7e1ecae91b31e93969cc392fbd0fdd@google.com>

hy0kl/nginx,hy0kl/nginx,hy0kl/nginx