Snippets for maildrop 3.1.0 from Fedora s390x

Sourced from https://kojipkgs.fedoraproject.org/packages/maildrop/3.1.0/9.fc45/data/logs/s390x/build.log.

• rfc2045.c:405:10: warning: variable 'num_levels' set but not used [-Wunused-but-set-variable=]
    405 | unsigned num_levels=0;
        |          ^~~~~~~~~~
  

• rfc2045cdecode.c:48:23: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     48 |                 if ((c=strchr(xdigit, tou(*a))) == 0) continue;
        |                       ^
  

• rfc2045cdecode.c:53:23: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     53 |                 if ((c=strchr(xdigit, tou(*a))) == 0) continue;
        |                       ^
  

• base64.c:47:33: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     47 |                         char *s=strchr(base64tab, *p);
        |                                 ^~~~~~
  

• maildirpurgetmp.c:101:10: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
    101 |         p=strrchr(maildir, '/');
        |          ^
  

• maildirshared.c:141:15: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
    141 | char    *name=strchr(folder, '.');
        |               ^~~~~~