Upstream: fix $upstream_cache_last_modified variable.
Upstream: fix $upstream_cache_last_modified variable.

Due to the u->headers_in.last_modified_time not being correctly initialized,
this variable was evaluated to "Thu, 01 Jan 1970 00:00:00 GMT" for responses
cached without the "Last-Modified" header which resulted in subsequent proxy
requests being sent with "If-Modified-Since: Thu, 01 Jan 1970 00:00:00 GMT"
header.

Signed-off-by: Piotr Sikora <2c0eb4a25a7cde333ff2d0860cb06051925fd74f@cloudflare.com>

firebase/nginx,firebase/nginx,hy0kl/nginx,firebase/nginx,hy0kl/nginx,firebase/nginx,hy0kl/nginx