More Mac build fixes.

The libziparchive public headers that refer to `off64_t` also need the
Mac workaround.

In fastboot, there's a stray `lseek64` but since it's only for offset 0,
any kind of seek is fine.

Bug: N/A
Test: builds
Change-Id: I68b4f95202623ebf07ffe6c3e0e21437e7922c5b
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 81350fd..24f74f0 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -852,7 +852,7 @@
         buf->image_size = sz;
     }
 
-    lseek64(fd, 0, SEEK_SET);
+    lseek(fd, 0, SEEK_SET);
     int64_t limit = get_sparse_limit(sz);
     if (limit) {
         sparse_file** s = load_sparse_files(fd, limit);