build: enable v8's siphash for hash seed creation #707
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Enable the v8_use_siphash flag. This flag is enabled since Node.js
v11.12.0 (2019-03-15), see linked PR, release notes, and the blog post
detailing the attack.
Ref: nodejs/node#26367
Ref: https://nodejs.org/gl/blog/release/v11.12.0/
Ref: https://darksi.de/12.hashwick-v8-vulnerability/