Disable "ahash-compile-time-rng" feature in hashbrown.

[eddyb]

This will ensure that every build uses the same ahash seed, instead of a compile-time randomized one (which is now the default - see rust-lang/hashbrown#124, rust-lang/hashbrown#125, tkaitchuck/aHash#18 and tkaitchuck/aHash#25 for more details/background).

(The other such update PR needed is paritytech/trie#36).

[parity-cla-bot]

It looks like @eddyb signed our Contributor License Agreement. 👍

Many thanks,

Parity Technologies CLA Bot

[codecov-io]

Codecov Report

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@@            Coverage Diff            @@
##             master      #90   +/-   ##
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  Coverage          ?   88.47%           
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  Files             ?       10           
  Lines             ?     3114           
  Branches          ?        0           
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  Hits              ?     2755           
  Misses            ?      359           
  Partials          ?        0

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