based on discussion in https://github.com/libressl/portable/issues/266
and https://bugs.python.org/issue23524 adjust the compat layer for
Windows to use _get_osfhandle in combination with
_set_thread_local_invalid_parameter_handler if applicable to more
reliably determine if a handle is a socket, file, or closed socket.
This prevents assertions when calling tls_close on an already-closed
socket.
- read() returns bytes count as 1 for crlf unless binary mode isn't
specified with open(). Reported by @ulfworsoe in libressl-portable#542
- err could be WSANOTINITIALISED when WSAStartup() is not called
This moves the compatibility include files from include to
include/compat so we can use the awful MS C compiler
<../include/> trick to emulate the GNU #include_next extension.
This also removes a few old compat files we do not need anymore.
