Added the option not to install the package#353

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triskeldeian wants to merge 4 commits intozeromq:masterfrom

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Commits on Oct 2, 2019

Added the option not to install the package
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Commits on Oct 8, 2019

Added a conditional to switch between searching zeromq variables or targets
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Merge branch 'master' of github.com:zeromq/cppzmq
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Commits on Nov 19, 2019

Merge branch 'master' of github.com:zeromq/cppzmq
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