Fix cmake CURL dependency #142
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FindCURL from cmake defines the variable
${CURL_LIBRARIES}, but${CURL_LIBRARY}(an empty variable) is used here instead. See https://cmake.org/cmake/help/v3.23/module/FindCURL.html. This has been the case since cmake 3.0, so this fix is backwards compatible.(The reason why this hasn't been a problem so far is probably due to the fact that CURL libraries are often installed in system directories that are linked to anyway. I noticed this bug when using a custom CURL installation directory.)