[config] Declare the args conditionally

Fuchsia compiles several flavors of ICU at once, and
each brings in its own declare_args.  This makes all
such compilations use the same args values, without
breaking the build.

Bug: fuchsia:116006
Change-Id: Ib2f8fd98e1b4f45f036f698dcf66a2255f898af4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/4054140
Reviewed-by: Frank Tang <ftang@chromium.org>
1 file changed