SystemTools: Remove redundant FindProgram signatures

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.

assigned to @brad.king

Do: stage

added 5 commits

• a7715880...ad56a91c - 2 commits from branch utils:master
• 4336afc4 - SystemTools: Remove redundant FindProgramPath function
• 54219234 - SystemTools: Remove redundant FindProgram signatures
• 7a633bad - SystemTools: Remove FindLibrary

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changed the description

Do: stage

mentioned in merge request cmake/cmake!10625 (merged)

Do: merge

mentioned in commit 0fa969cb

merged manually