CBD-913: ICU50 rename libaries

Compared to icu4.x, icu5.0 rename the following libraries:
icudata.dll -> icudt.dll
icui18n.dll -> icuin.dll

Change-Id: I932a97b3bc052c8cdfd873af03a24af68c0e24b2
Reviewed-on: http://review.couchbase.org/25247
Reviewed-by: Bin Cui <bin.cui@gmail.com>
Tested-by: Bin Cui <bin.cui@gmail.com>