Fix #103: Remove random-mt19937-update

We don't use the MT19937 RNG anymore, so we can remove this assembly
routine.  But since the code still exists for mt19937, just use
reader-conditionals to disable this.
10 jobs for issue-103-remove-random-mt19937-update in 23 minutes and 54 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Install
passed #9480
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linux:install

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osx:install

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  Build
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linux:build

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passed #9483
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osx:build

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  Test
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linux:test

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osx:test

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  Ansi Test
passed #9486
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linux:ansi-test

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passed #9487
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osx:ansi-test

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  Benchmark
passed #9488
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linux:benchmark

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passed #9489
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osx:benchmark

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