Fix the missing ucadata.icu when generating icudt42l-zh.dat.
Collation uca table is moved from data(locale data root) to data/coll in
ICU4.2.1.  icudt42l-zh.dat is a new data file added from the merge of master
branch and upstream-merge branch.

  Bug: 1823720
  Reviewed-by: enh@google.com
  CC:
  Signed-off-by:
3 files changed