installd: Delete cache properly for devices using datadata partition

The java side already checks /data/data for free space but installd
still checks /data causing it to never reap the cache (because it
thinks that enough free space is available.)

Change-Id: I736af6ff7ea0c8ae07900168f6b8ac2f7a4dbe0b
MemoryHeapBase: ifdef for gingerbread/froyo compatibility

Allow to "revert" by a board config flag the offset member addon
see commit f24c4cd0f20 (aosp change id Ie618fb5c0718e)

This change is required to use overlay based proprietary camera libs
coming from gingerbread and froyo builds.

This change also requires a global cflag named BINDER_COMPAT
because a lot of modules use the MemoryHeap includes

Add this in your BoardConfig.mk :
COMMON_GLOBAL_CFLAGS += -DBINDER_COMPAT

Backported from /#/c/13317/

Change-Id: Ic8e18bc60a7310b0fa90ad251381e9f7d9e58d5e