avoid issues when socket.close is called from a __del__ method.

fine.  They were failing due to a problem exposed in r84307 and fixed
in r84317.   See Issue 8781 for details.

Fix issue #9711: raise ValueError is SSLConnection constructor is invoked with keyfile and not certfile.

Sébastien Sablé.

in ssl tests rely on IOError.errno rather thanf IOError.strerror for better compatibility across platforms.

Raise ValuError if non-zero flag argument is provided for sendall() method for conformity with send(), recv() and recv_into()

to the socket module, and fix the width of socket descriptors to be
correctly detected under 64-bit Windows.

getting rid of the cached copy of thread-local attribute dictionary.

inputs to the nearest integer.  Thanks Neil Tallim for the patch.

and make.

already exists, not IOError.

Part of the continuing saga of issue #9572.

LC_ALL is read before LANG to choose the locale encoding (LC_ALL, LANG and then
LC_CTYPE: use the first non empty variable).