errno, strerror-override: Support for MSVC 10.

errno, strerror-override: Support for MSVC 10.

* lib/errno.in.h (GNULIB_defined_ETXTBSY): Remove macro.
(ENOMSG, EIDRM, ENOLINK, EPROTO, EBADMSG, EOVERFLOW, ENOTSUP,
ENETRESET, ECONNABORTED, ECANCELED, EINPROGRESS, EALREADY, ENOTSOCK,
EDESTADDRREQ, EMSGSIZE, EPROTOTYPE, ENOPROTOOPT, EPROTONOSUPPORT,
EOPNOTSUPP, EAFNOSUPPORT, EADDRINUSE, EADDRNOTAVAIL, ENETDOWN,
ENETUNREACH, ECONNRESET, ENOBUFS, EISCONN, ENOTCONN, ETIMEDOUT,
ECONNREFUSED, ELOOP, EHOSTUNREACH, EWOULDBLOCK, ETXTBSY) [Win32]:
Assign values compatible with MSVC 10.
(ENODATA, ENOSR, ENOSTR, ENOTRECOVERABLE, EOWNERDEAD, ETIME, EOTHER):
New macros.
(GNULIB_defined_EWINSOCK): New macro.
* lib/strerror-override.c (strerror_override): Update accordingly.
* lib/strerror-override.h: Likewise.
* lib/w32sock.h (set_winsock_errno): Map those WSA* values that are no
longer equal to the corresponding errno value.
Reported by Michael Goffioul <michael.goffioul@gmail.com>.