Make minified builds more determinstic

May fix #3999, but will need to see if Mozilla can reproduce the build
with this updated repo.

Switches our `uglifyify` dependency from the production one
(under-maintained) to one that I've merged a critical patch into.

I'm open to discussion of how else we might approach this problem here.
Maybe we should use a different minification module entirely, remove
minification, or maybe refactor our build system!

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