Make cmake copy_directory instead of just files

The only gn copy commands we do at the moment are for directories, which
copy (not copy_directory) will silently ignore.

Bug: skia:8732
Change-Id: Ibd8206972c90976085d4b560f28bbb088947ea75
Reviewed-on: https://skia-review.googlesource.com/c/188305
Auto-Submit: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed