utils: returning "moved" pointers from functions in interfaces.cpp

[ClaytonNorthey92]

prior, in interfaces.cpp, we were returning unique_ptrs with implicitly deleted constructors, resulting in compiler errors. now, "move" those unique_ptrs to ensure compilation and avoid this error

this issue is similar to this issue

[DrahtBot]

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[maflcko]

Please keep the code changes and discussion in one place

[fanquake]

Please respond to the question in your first PR. It's almost certain that you are trying to use a compiler that is no-longer supported.

[ClaytonNorthey92]

@fanquake @maflcko you're both right, sorry for the confusion, my clang version was too old