* Find build-tool installed programs before programs in path (BP)

A backport of 443c8906581e4a985185a9a32de2e6c7cc63dde1 (#9762)

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Co-authored-by: brandon s allbery kf8nh <allbery.b@gmail.com>
Co-authored-by: Gershom Bazerman <gershom@arista.com>