[PATCH 0 of 2] Debug_random directive & win32 ngx_random fix

[J Carter]

This patch series reworks previous proposal for debug_random directive,
with (re)consideration for advice on unessecary complexity.

(see mailing list, August 2nd 2023)
https://mailman.nginx.org/pipermail/nginx-devel/2023-August/BQNBXJFIIHFLHRE2ASU4QHPTMWPJUP5D.html

Resubmitting as a series due to later discovered issue with win32's 
ngx_random.

- First patch implements debug_random directive.
- Second patch provides a dependent fix for win32 api's implementation
of ngx_random.

Any feedback would be much appreciated.