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I did a little digging, and I was able to get it building without having to hunt down all the #if UNITY_EDITOR placements.

I moved MAST_Prefab_Component into a new folder called Components that's along side the Scripts folder.  I then added an asmdef file in both folders, I set the scripts' asmdef to be editor only,  and gave it a reference to the components' asmdef. 

I actually get the same issues trying to create a build on windows. (Version 1.1)

Could it be an issue with the Unity Package missing asmdef files? I don't see any when I do the import?