Fixes a few minor problems with AAPT

- Fixes casting problems with stricter compilers
- Adds a couple of missing ifdef guards

This is a first step toward being able to generate APKs on the fly on the device.

Bug: 2766918
Change-Id: Icaaee5a4032afa313256add321b447443861dd85
diff --git a/tools/aapt/ZipFile.h b/tools/aapt/ZipFile.h
index dbbd072..7877550 100644
--- a/tools/aapt/ZipFile.h
+++ b/tools/aapt/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