Mirko Bonadei efb1292574 Remove WEBRTC_EXTERNAL_JSON.
The flexibility offered by the GN `rtc_jsoncpp_root` should be enough
to wire a different version of jsoncpp.

Bug: b/281848049
Change-Id: I8af39fec2406e27c3af7b7ec1949a4762dce762f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/304861
Reviewed-by: Jeremy Leconte <jleconte@google.com>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40045}
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