fix(maker): allow Linux makers to run on non-Linux hosts if possible

[malept]

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Summarize your changes:

Adds a method that checks for the binaries required for a maker to run. For example, @electron-forge/maker-deb requires dpkg and fakeroot.

Fixes #539.

[malept]

@MarshallOfSound I wonder if we should delegate this to the installer modules. But that would require us to require() the modules much earlier in the workflow, I think.

[malept]

Let's start with this and we can change it later if we want.