Delete talk directory, and references from build_ios_libs.sh.

BUG=webrtc:4256

Review-Url: https://codereview.webrtc.org/2296613002
Cr-Original-Commit-Position: refs/heads/master@{#14040}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 3d21e23df22d885b6a58720bec0f131391d40508
102 files changed
tree: 4b825dc642cb6eb9a060e54bf8d69288fbee4904

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