Use the icu4c headers from the new location.
Use the icu4c headers from the new location.

Change-Id: I6ca56e8f9909bf3644a5f79f2d705547ddba6d03

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst