Update.

Update.

	* conform/conformtest.pl: Run Unix tests for XPG6.
	Implement handling of known namespace violations.
	Improve printing of results.

	* posix/unistd.h (usleep): Correct return type.
	* sysdeps/unix/sysv/linux/usleep.c: Correct return type.
	* sysdeps/unix/bsd/usleep.c: Correct return type.
	* sysdeps/mach/usleep.c: Correct return type.
	* sysdeps/generic/usleep.c: Correct return type.

	* posix/unistd.h (sync): Correct return type.
	* sysdeps/generic/sync.c: Likewise.
	* sysdeps/mach/hurd/sync.c: Likewise.

	* sysdeps/generic/bits/confname.h (_SC_IOV_MAX): New definition.