pathname_cwd should decode cwd() before use

[xworld21]

Offending line, I think:

LaTeXML/lib/LaTeXML/Util/Pathname.pm

Line 232 in dfc3bc9

if (my $cwd = cwd()) {

It turns out that Cwd returns bytes (char *) that need to be decoded in the appropriate locale. The current behaviour causes issues in postprocessing when non-ASCII characters are present (see vlmantova/bookml#18). Even just running latexmlpost will show 'paginating /path/to/file.xml' with mangled characters.

Cc @leorolla

[xworld21]

(Alternatively, Pathname functions should work on bytes, not strings! Which might be the safer alternative, since detecting the filesystem encoding is not an easy task.)

[xworld21]

I should note that this is not a Windows bug, we have replicated it on Linux and macOS.