Change assets to use 64-bit API

The asset system and supporting libraries were using off_t instead of
off64_t to access files larger than 2GB (32-bit signed). This change
replaces all off_t with off64_t and lseek64.

There is a new utils/Compat.h added for Mac OS compatibility.

Also fixed some size-related compiler warnings.

Bug: 3205336
Change-Id: I9097b3cb7a602e811fe52f245939d8975da55e9e
diff --git a/tools/aapt/Package.cpp b/tools/aapt/Package.cpp
index faae89b..ab71f34 100644
--- a/tools/aapt/Package.cpp
+++ b/tools/aapt/Package.cpp
@@ -461,7 +461,7 @@
         ZipFile jar;
         err = jar.open(jars[i], ZipFile::kOpenReadOnly);
         if (err != 0) {
-            fprintf(stderr, "ERROR: unable to open '%s' as a zip file: %zd\n",
+            fprintf(stderr, "ERROR: unable to open '%s' as a zip file: %d\n",
                 jars[i], err);
             return err;
         }