(maint) Use leatherman_install helper
(maint) Use leatherman_install helper

Use the leatherman_install helper to simplify install statements, and
avoid renaming the library suffix on Windows.

MikaelSmith/cpp-pcp-client,puppetlabs/cpp-pcp-client,MikaelSmith/cpp-pcp-client,puppetlabs/cpp-pcp-client,MikaelSmith/cpp-pcp-client,MikaelSmith/cpp-pcp-client,MikaelSmith/cpp-pcp-client,puppetlabs/cpp-pcp-client,puppetlabs/cpp-pcp-client