Export libicuuc_headers

This allows vendor modules to include headers via VNDK-compliant way
LOCAL_HEADER_LIBRARIES += libicuuc_headers
rather than old way
LOCAL_C_INCLUDES += external/icu/icu4c/source/common

Bug: 36529495
Test: Build sailfish
Change-Id: Id2399444d3e588f86c8e97a14bd11fd87f4e54dd
1 file changed