Remove hardcoded ICU include paths.

ICU exports them using LOCAL_EXPORT_C_INCLUDE_DIRS.

NOTE: It isn't clear why this CleanSpec is required, but
it seems like SOP for this project and i don't see the
import_includes file being regenerated without.

bug: 18581021
Change-Id: I0352de555a93c345ba9e43cba99a876bdf97265f
4 files changed