new module 'strerrorname_np'

[Bruno Haible]

strerrorname_np is another new function in glibc 2.32. It is probably useful
for the runtime library of many programming languages (such as guile or
GNU clisp).

Here's a module which adds support for it to gnulib, so that it may be
used in GNU code without portability worries.

Note: The function is completely unusable in glibc 2.32, see
<https://sourceware.org/bugzilla/show_bug.cgi?id=26555>. Gnulib overrides
it therefore.

I also don't want to hide from you these two error codes:
In GNU/Hurd there is

  EIEIO                          = 0x40000068, /* Computer bought the farm */

and in MirBSD 10 there is

#define ENOCOFFEE       85              /* Programmer needs more coffee */

0001-strerrorname_np-New-module.patch
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0002-strerrorname_np-Add-tests.patch
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