{cmake} Added missing include for GNUInstallDirs #315
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The definition of
E57_INSTALL_CMAKEDIRusesCMAKE_INSTALL_LIBDIRwhich is set by theGNUInstallDirsmodule. This module however is not directly included. It is included fromgoogletest, and therefore made transitively available if tests are enabled. If tests are disabled, the module is never loaded, and soCMAKE_INSTALL_LIBDIRis never defined, which leads to an unexpected expansion.This PR fixes #314 by including the module before using the variable.