Allow certain dependencies to be excluded for sysimg #673
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It is possible for a package to depend on more than it needs, for eaxmple, to allow switching backends at run time. One example is the FFTW.jl.
In some cases, it is desirable to exclude certain dependencies to avoid downloading or shipping with shipping artifacts that are not needed for an app (e.g. the MKL_jll.jl which FFTW.jl depends on, but not used by default).
Potentially fix #639, where the unused package with lazy artifact can be explicitly excluded for building system image/app.