Use size_t* in AssetManager::createIdmap

ResTable::createIdmap takes a size_t*, and the idmap command is
passing in a size_t*, make AssetManager::createIdmap take a
size_t*.  Should fix the mac build.

Change-Id: Idc16dedfe2aa7367c75f89a937a8242d494e8f8e
diff --git a/include/androidfw/AssetManager.h b/include/androidfw/AssetManager.h
index ac47900..a13dd16 100644
--- a/include/androidfw/AssetManager.h
+++ b/include/androidfw/AssetManager.h
@@ -231,7 +231,7 @@
      * corresponding overlay package.
      */
     bool createIdmap(const char* targetApkPath, const char* overlayApkPath,
-        uint32_t targetCrc, uint32_t overlayCrc, uint32_t** outData, uint32_t* outSize);
+        uint32_t targetCrc, uint32_t overlayCrc, uint32_t** outData, size_t* outSize);
 
 private:
     struct asset_path