include icu dependencies based on target platform

I used minikin's build file as a hint to how we look for icu on non-Android targets
https://source.corp.google.com/android/frameworks/minikin/libs/minikin/Android.bp;l=94

Change-Id: I4c37fd2135d1e0d1e1f91076609c41af2adcec62
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/611681
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>
1 file changed