GN recently added support for Apple frameworks to link, rather than
overloading the libs lists. This pulls .frameworks out of the libs
lists, so that GN can stop supporting .frameworks in libs in the
future.

Bug: chromium:1052560
Change-Id: I3aed298db01bdb5f6e7f37a74c1bbc06f99d760c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2279931Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>