do not set deprecated target args

I was unable to set a setup arg via `target_args`, because the value would be overridden by the empty value in `setup_args`.  And if I tried to set `setup_args` I got a fail saying it was deprecated.

Author: matt-sm

foreign_cc/meson.bzl

@@ -128,8 +128,6 @@ def _create_meson_script(configureParameters):
         if args_ and target_name in target_args:
             fail("Please migrate '{t}_args' to 'target_args[\"{t}\"]'".format(t = target_name))
 
-        target_args[target_name] = args_
-
     # --- TODO: DEPRECATED, delete on a future release ------------------------
 
     # Expand target args