[icudata] Make 'copy_icudata' a public_deps

Otherwise, the targets depending on :icudata will
not see the the indirection, and will not recognize
the `icudtl.dat` file as an output, which fails
the `gn gen` step.

With this change, compilation succeeds again.

Tested: compiled for target_os="android"
Bug: fuchsia:117972
Change-Id: Ie9ec42d922d498c779b075b13249c8d5b15b3d00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/4231817
Reviewed-by: Frank Tang <ftang@chromium.org>
1 file changed