This is an update of ocamlnet to its newest version, 3.6. Changes are:
* Netsys_sem: a new abstraction for emulating anonymous
semaphores on systems that only provide named semaphores,
like OS X. All users of semaphores inside Ocamlnet now
base on Netsys_sem.
* reimplementing Netstring_str for the case the Str engine
is used. It is now thread-safe without having to use
mutexes.
* The default is now -disable-pcre
* The module Netstring_pcre has been moved to a library of its
own, namely netstring-pcre. It is only installed if -enable-pcre
* Nethttp.Header.best_media_type: improved
(patch by Christopher Zimmemann)
* Netsys_mem.alloc_memory_pages: one can now mark the memory
pages as executable
* src/netsys/configure: disabling POSIX semaphore check
for win32
* Fixes for OpenBSD (by Christopher Zimmermann)
* Netcgi connectors (SCGI, AJP, FCGI): unifying the ~sockaddr
and ~port arguments. ~port now also assumes a loopback binding.
(Suggested by Christopher Zimmermann).
* Allowing posix_spawn again for MacOS. It turns out the
number of file actions is limited. If we are above the
limit, posix_spawn is not used.
* Ssl_exts: adding function for returning the fingerprint of
a certificate
* Https_client: new verify callback for additional certificate
checks
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