[cmake] Fixed a warning regarding search paths.

Python should be copied to lib-folder at install time, not at
configure time. file(INSTALL ..) is an alias to file(COPY ...) and
therefore a bit misleading, use install(FILE ...) instead!

scripts/cmake/packaging/Pack.cmake

@@ -76,9 +76,7 @@ if(WIN32)
          DESTINATION ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}
     )
 else()
-    file(INSTALL ${Python_LIBRARIES} DESTINATION ${CMAKE_INSTALL_LIBDIR}
-         FOLLOW_SYMLINK_CHAIN
-    )
+    install(FILES ${Python_LIBRARIES} DESTINATION ${CMAKE_INSTALL_LIBDIR})
 endif()
 
 configure_file(Documentation/README.txt.in ${PROJECT_BINARY_DIR}/README.txt)