Core:test_path_length:3 test failure when linked against musl

[Marecki]

Since at least version 4.8.29, Midnight Commander fails one of its tests when linked against MUSL:

path_len.c:116:F:Core:test_path_length:3: Assertion 'actual_length == data->expected_length' failed: actual_length == 12, data->expected_length == 38

The same test passes when mc is linked against glibc. I suspect this might have something to do with how limited iconv support is in MUSL but unfortunately I know nowhere nearly enough about either that libc or mc internals to attempt to fix the problem myself.

Version information for both glibc- and musl-linked mc-4.8.30. In either case Midnight Commander was installed directly into a clean test system so different libc implementation should have been the only difference between the two:

* built against musl *

GNU Midnight Commander 4.8.30
Built with GLib 2.76.3
Built with S-Lang 2.3.2 with terminfo database
With builtin Editor
With subshell support as default
With support for background operations
With mouse support on xterm
With multiple codepages support
With ext2fs attributes support
Virtual File Systems:

cpiofs, tarfs, sfs, extfs, ext2undelfs, ftpfs, fish

Data types:

char: 8; int: 32; long: 64; void *: 64; size_t: 64; off_t: 64;

* built agains glibc *

GNU Midnight Commander 4.8.30
Built with GLib 2.76.3
Built with S-Lang 2.3.2 with terminfo database
With builtin Editor
With subshell support as default
With support for background operations
With mouse support on xterm
With internationalization support
With multiple codepages support
With ext2fs attributes support
Virtual File Systems:

cpiofs, tarfs, sfs, extfs, ext2undelfs, ftpfs, fish

Data types:

char: 8; int: 32; long: 64; void *: 64; size_t: 64; off_t: 64;