Snippets for arc-archive 5.21p from Fedora aarch64

Sourced from https://kojipkgs.fedoraproject.org/packages/arc/5.21p/34.fc45/data/logs/aarch64/build.log.

• arcmisc.c:355:16: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
    355 |         string = direntry->d_name;
        |                ^
  

• arcmisc.c:260:9: warning: ignoring return value of ‘getcwd’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
    260 |         getcwd(dirname, 1024);
        |         ^~~~~~~~~~~~~~~~~~~~~