Install cmake targets in correct directory

--- cppgir-960fe054ffaab7cf55722fea6094c56a8ee8f18e.orig/CMakeLists.txt
+++ cppgir-960fe054ffaab7cf55722fea6094c56a8ee8f18e/CMakeLists.txt
@@ -259,7 +259,7 @@
     DESTINATION ${GI_IGNORE_FILE_INSTALL_DIR})
 
 # cmake EXPORTS
-set(CONFIG_PACKAGE_LOCATION lib/cmake/${PROJECT_NAME})
+set(CONFIG_PACKAGE_LOCATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 set(CONFIG_VERSION_NAME ${PROJECT_NAME}-config-version.cmake)
 set(CONFIG_TARGETS_NAME ${PROJECT_NAME}-targets.cmake)
 set(CONFIG_NAME ${PROJECT_NAME}-config.cmake)