* cygserver_ipc (class ipc_retval): Add ssize_t member to anonymous union.
(ipc_retval::operator =): Add ssize_t variant for x86_64.
* fhandler_floppy.cc (fhandler_dev_floppy::raw_write): Change return
type to ssize_t to match fhandler.h.
* fhandler_socket.cc (fhandler_socket::readv): Ditto.
(fhandler_socket::write): Ditto.
(fhandler_socket::writev): Ditto.
(fhandler_socket::sendmsg): Ditto.
Pull in changes from HEAD
	* Makefile.in (target_cpu): Define.  Check for target_cpu rather than
	target_alias for conditional compilation issues.
	(toolopts): Change --target into --cpu option and use $target_cpu as
	argument.
	($(DEF_FILE)): Call gendef with $(target_cpu) as argument, rather than
	with $(target_alias).
	* gendef: Accommodate change from --target to --cpu option.
	* mkimport: Ditto.
	* speclib: Ditto.
	* Makefile.in (target_cpu): Define.  Check for target_cpu rather than
	target_alias for conditional compilation issues.
Pull in changes from HEAD
Merge branch 'cygwin64' into msys2-64-dev