dosutils: add RIGHTS and finish Novell-style display fixes

- add RIGHTS as a new multi-call DOS utility
- implement Client32 NCP87 effective-rights query helper
- map NCP effective-rights bits to Novell RIGHTS display order
- keep legacy directory-handle based rights lookup as fallback
- match Novell RIGHTS output for directories and files more closely
- remove hardcoded MARS/SYS and SYS display fallbacks from RIGHTS/FLAGDIR
- derive display prefixes from the active network drive where available
- adjust FLAGDIR output formatting to match Novell field alignment
- keep FLAG and SLIST unchanged after checking for hardcoded prefixes

teste.c

@@ -22,11 +22,11 @@ int main()
    close(fd);
    _chmod(fn, 1, _chmod(fn, 0) | 0x80 );
    stat(fn, &stbuff);
-   printf("Filesize <20>ber stat =%ld\n", stbuff.st_size);
+   printf("Filesize <20>ber stat =%ld\n", stbuff.st_size);
    fd = open(fn, O_RDWR | O_BINARY |O_DENYNONE);
 
    offset = lseek(fd, 0L, SEEK_END);
-   printf("Filesize <20>ber lseek =%ld\n", offset);
+   printf("Filesize <20>ber lseek =%ld\n", offset);
    write(fd, buff, strlen(buff));
 
    lseek(fd, 0L, SEEK_SET);