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To enable thin archives on posix, the current plan is to:
1. Land this CL.
2. Remove thin_archive from third_party build files as appropriate.
3. Uncomment the arflags = [ "-T" ] that this CL adds.

If you want a standalone static library, you now need to both set
complete_static_lib=true and remove the thin_archive config. See the comment in
build/config/compiler/BUILD.gn for details.

BUG=801925
R=thakis,dpranke
TBR=sky

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Icd1d3389da13106f46de3468475f0102a88c6211
Reviewed-on: https://chromium-review.googlesource.com/954344Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544221}