ExternalProject: Remove N^2 add_dependencies() calls

ExternalProject_Add_StepDependencies() contained a foreach() loop that
had another foreach() loop inside it iterating over the same set of values
(the dependencies). This resulted in add_dependencies() calls that added
the same dependencies to the step target N^2 times. A single call to
add_dependencies() with the list of dependencies provides the necessary
relationships without the N^2 behavior, and it removes the inner foreach()
loop.

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