missing errno values

[Eric Blake]

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POSIX 2001 requires ECANCELED (and while this was added in Feb, strerror
did not pick it up).  And POSIX 200x, due out later this year, adds
ENOTRECOVERABLE and EOWNERDEAD (in the context of robust mutexes).  OK to
commit?  Or should the new values occupy some of the previously reserved
values (for example, 47 and 48)?

Once this is approved, I will post the followup patch to cygwin's
_sys_errlist in their error.cc file (it already has to grow to support
ECANCELED, whether or not the two new macros are injected in the middle to
save size).

2008-09-15  Eric Blake  <ebb9@byu.net>

	Supply missing POSIX errno values.
	* libc/include/sys/errno.h (ENOTRECOVERABLE, EOWNERDEAD): Define.
	* libc/string/strerror.c (strerror): Decode them, and ECANCELED.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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