Fix build warning

Change-Id: I1e3a76e4bdae5eec4f75c5d8eb9f533afab6d140
diff --git a/tools/zipalign/ZipFile.h b/tools/zipalign/ZipFile.h
index dbbd072..7877550 100644
--- a/tools/zipalign/ZipFile.h
+++ b/tools/zipalign/ZipFile.h
@@ -57,7 +57,7 @@
     /*
      * Open a new or existing archive.
      */
-    typedef enum {
+    enum {
         kOpenReadOnly   = 0x01,
         kOpenReadWrite  = 0x02,
         kOpenCreate     = 0x04,     // create if it doesn't exist