Impl. setting stored UID/GID if EUID 0

TODO:
    Extract symlinks in new format (implemented but untested).
    Extract compressed files in new format.

src/archiver.c

@@ -1438,6 +1438,8 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
       }
       uc_heap_buf[u16 - 1] = 0;
       fprintf(stderr, "Decompressor cmd: %s\n", uc_heap_buf);
+      decompressor_cmd = heap_buf;
+      heap_buf = NULL;
     }
   } else {
     fprintf(stderr, "De/compressor flag is NOT set.\n");