strerror(0) POSIX compliance

[Kamil Rytarowski <n54%gmx.com@localhost>]

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POSIX extension to ISO C says:

[CX] [Option Start] If the value of errnum is a valid error number,
the message string shall indicate what error occurred; if the value of
errnum is zero, the message string shall either be an empty string or
indicate that no error occurred; otherwise, if these functions
complete successfully, the message string shall indicate that an
unknown error occurred. [Option End]

http://pubs.opengroup.org/onlinepubs/9699919799/functions/strerror.html

Currently we hardcode the following text:
        "Undefined error: 0",                   /*  0 - ENOERROR */

- -- src/lib/libc/compat/gen/compat_errlist.c

gnulib check for strerror(0) POSIX compliance and it prohibits
"ndefined" string.

http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=tests/test-str
error.c#l63

Can we change this string to "No error" indicating that there is no
error? GNU returns "Success".
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