Yet another Mac fix.

  system/core/libziparchive/zip_archive.cc:847:36: error: use of undeclared identifier 'lseek64'; did you mean 'lseek'?
  const off64_t current_offset = lseek64(fd, 0, SEEK_CUR);

Bug: N/A
Test: builds
Change-Id: If762011722d53376bb6dab35c6ee8031762e5a95
diff --git a/libziparchive/zip_archive.cc b/libziparchive/zip_archive.cc
index 9d6d919..9eb7f2c 100644
--- a/libziparchive/zip_archive.cc
+++ b/libziparchive/zip_archive.cc
@@ -34,6 +34,10 @@
 #include <memory>
 #include <vector>
 
+#if defined(__APPLE__)
+#define lseek64 lseek
+#endif
+
 #if defined(__BIONIC__)
 #include <android/fdsan.h>
 #endif