Fix bug in the CMake install interface #44
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We previously relied on `CMAKE_INSTALL_INCLUDEDIR` being set, but this is not guaranteed unless `GNUInstallDirs`. CMake, of course, was quietly swallowing this code and producing invalid installations. This commit ensures that `GNUInstallDirs` is always loaded before the install interfaces are defined, and also uses the `CMAKE_INSTALL_INCLUDEDIR` variable more consistently.
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We previously relied on
CMAKE_INSTALL_INCLUDEDIRbeing set, but this is not guaranteed unlessGNUInstallDirs. CMake, of course, was quietly swallowing this code and producing invalid installations. This commit ensures thatGNUInstallDirsis always loaded before the install interfaces are defined, and also uses theCMAKE_INSTALL_INCLUDEDIRvariable more consistently.