New LOCAL_SDK_RES_VERSION config var.

This allows an app to target a different SDK level for its resources
than it uses for its Java code.  This is useful because it is generally
safe to use various newer symbols like attribute names, as older versions
of the platform will simply ignore them.

Change-Id: Ida19ec9f259c4ea70de846e9a63546e263b1c91e
2 files changed