This target already exists in internal master, avoid the name conflict
until there is only one set of build files.

BUG=b:142320172

Change-Id: Ida176f39422c1c57cc2936a06e61b7e86bf2cc90
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2101367Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>
Commit-Queue: Geoff Lang <geofflang@chromium.org>