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

tools/aapt/StringPool.cpp

@@ -30,7 +30,7 @@ void printStringPool(const ResStringPool* pool)
             str = String8(pool->stringAt(s, &len)).string();
         }
 
-        printf("String #%d: %s\n", s, str);
+        printf("String #%zd: %s\n", s, str);
     }
 }