hello-2.11 fails multibyte-1 and atexit-1 on musl

[Sergei Trofimovich]

Hi hello maintainers!

I attempted to package hello-2.11 in NixOS and stumbled on
two test failures on x86_64-unknown-linux-musl:

    FAIL: tests/atexit-1
    FAIL: tests/multibyte-1

Detailed log:

    FAIL: tests/atexit-1
    ====================
    
    1c1
    < hello: write error: No space left on device
    ---
    > hello: write error
    FAIL tests/atexit-1 (exit status: 1)
    
    FAIL: tests/multibyte-1
    =======================
    
    1c1
    < hello: conversion to a multibyte string failed: Invalid or incomplete 
multibyte or wide character
    ---
    > hello 世界
    FAIL tests/multibyte-1 (exit status: 1)

>From what I understand at
    
https://wiki.musl-libc.org/functional-differences-from-glibc.html#Character-sets-and-locale
musl deliberately supports any char -> wchar_t (and back) conversion for
any char in LC_CTYPE=C. And thus the multibyte-1 test will always fail
there.

Not sure why atexit-1 fails. It seems to rely on
close_stdout_set_file_name() call in atexit(), but I don't see where in
code it's registered to call.

Thanks!

-- 

  Sergei