PR standards/44921: Add errno consts for robust mutexes

Add the two missing errno.h constants: EOWNERDEAD and ENOTRECOVERABLE.
While technically they're used for robust mutexes which we do not
support at the moment, they are listed in POSIX and used by libc++.
While libc++ can be made to build without it, it just locally redefines
the values then, so we may as well define them globally.

Sync signal messages between catalog and sys_siglist

Sync errno messages between catalog and errno.h

Changed error message of ENOPROTOOPT to "Protocol option not available".

Add the 3 new error messages.

Add ENOATTR ("Attribute not found"). From FreeBSD.

ETIME is #92, not #91

Add ETIME, per POSIX-2001.

Change the strerror() string for ERANGE consistently to "Result too
large or too small" and reword its intro(2) description to reflect
the present use for non-numerical out-of-range errors; resolves
Andrew Brown's PR standards/21004, the discussion of which was
dramatically sped up by repeated whipping from Perry Metzger. :-)

Review oversight: ENOSR: resource -> resources, which is what the
standard says, and which fits the resource allocation failure better.

Add the missing errno symbols that are defined in IEEE Std 1003.1-2001.
The language message files need updating.

Change reviewed and OK'd by Klaus Klein.

branches: 1.6.6;
Add an EILSEQ code (C99, first appeared in C90/AMD1), and update message
catalogs where possible.

add SIGPWR entry

Introduce EOVERFLOW.

Add ENOMSG.

add EAUTH, ENEEDAUTH, EIDRM

C and Pig Latin message catalogs for libc