MB-9597: Try to grab more information out of icu-config

Change-Id: I69431382c9ae79f482e422d822019004f06551f4
Reviewed-on: http://review.couchbase.org/30450
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Tested-by: Volker Mische <volker.mische@gmail.com>