Avoid testing how rcedit works and just test the rcedit option transform

[malept]

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Summarize your changes:

This should make the win32 tests run a bit faster since it's not running the whole packager function. Also gets rid of a devDependency 🎉

CC: @dmascord - this should help you write tests for #610.

[malept]

FYI, running node test/win32 goes from 1m14s (master) to 10s (PR).