do not free() stack allocated buffer

remove r->zero_in_uri

cache related fixes:

*) do not cache response if it has "no-store" or "private"
   in "Cache-Control" header
*) proxy_no_cache and fastcgi_no_cache

use lstat() for WebDAV DELETE, COPY, and MOVE to handle symlinks

opening files fixes:

*) use non-blocking open() not to hang on FIFO files, etc.
*) do not log misleading errno in "not a regular file" error

*) MSVC8 compatibility with OpenSSL 1.0.0
*) fix building OpenSSL-1.0.0 on 64-bit Linux:
   make installs the libraries in lib64 directory

and build nginx/Windows against OpenSSL-0.9.8n