Remove ART aggregation of libcore, conscrypt and icu sources

Removes an extra aggregation step in the process of building the public
APIs.

Bug: 153306490
Test: m nothing
Bug: 142935992
Merged-In: I25d1c2e89a5f4ae1f5db101681326301b4707fb6
Change-Id: I25d1c2e89a5f4ae1f5db101681326301b4707fb6
(cherry picked from commit 93f2f6c3a8828fdac34718b2f10df34d79092617)
1 file changed