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: Ief11c081d55b07e61252a3c66c315ceaf79de0b7
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/46108
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Presubmit-Ready: Sylvain Defresne <sdefresne@chromium.org>