Make libicuuc shared library only

VTS no longer needs the static libicuuc.

Effectively, it reverts "Provide static libicuuc for tests"

This reverts commit 9adf475a99509560cc102d7efc559a2d808504b6

Bug: 121468463
Test: m vts
Change-Id: I12328ae220cd61b2ff3dc0fa0def304fdf428119
1 file changed