SystemTools: Remove redundant FindProgram signatures

Brad Kingrequested to merge
brad.king/kwsys:SystemTools-remove-find into master

The caller can easily convert arguments to use the primary signature.

Also remove:

  • FindProgramPath: It just wraps around FindProgram with operations that can be better performed by the caller.
  • FindLibrary: This was only used by CMake, which does its own thing now.
Edited by Brad King

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