libbinder: Export older versions of binder symbols

libbinder's enforceInterface function has changed, and even though the API
is backwards-compatible, the ABI isn't. Proprietaries linked with an older
(pre-gb) libbinder.so will fail without this
Additionally, ICS changed the argument types for appendFrom; add a wrapper
for that one.

Change-Id: Ib719f6fba3d8725ad81a2afaa419b7ee52fd3780