Make it possible to compile ICU both with the host and target toolset.

If the system ICU library is supposed to be used, still compile ICU for the
host toolset if we're using separate host and target toolsets, as the system
ICU in general is only available for the target.

BUG=none
R=mark@chromium.org

Review URL: https://codereview.chromium.org/19490004

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/icu46@212587 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed