Remove empty zip warning on host builds

Change-Id: Iaafe208930c316cc32f39ce2687be555b9eeb35f
diff --git a/libziparchive/zip_archive.cc b/libziparchive/zip_archive.cc
index f9f8c73..5e5e7af 100644
--- a/libziparchive/zip_archive.cc
+++ b/libziparchive/zip_archive.cc
@@ -224,7 +224,9 @@
     return kInvalidOffset;
   }
   if (eocd->num_records == 0) {
+#if defined(__ANDROID__)
     ALOGW("Zip: empty archive?");
+#endif
     return kEmptyArchive;
   }