fuzzers: ignore size limits when compiled standalone

This way we can still call fuzzers on old samples, but oss-fuzz will not waste
its and our time finding overly large inputs.

src/journal/fuzz-journald-stream.c

@@ -16,7 +16,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         StdoutStream *stream;
         int v;
 
-        if (size == 0 || size > 65536)
+        if (outside_size_range(size, 1, 65536))
                 return 0;
 
         if (!getenv("SYSTEMD_LOG_LEVEL"))