fixes https://github.com/AcademySoftwareFoundation/OpenShadingLanguage/issues/1771
by just not installing these files

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -294,13 +294,6 @@
 install (FILES "${OSL_PROJECT_CONFIG}" "${OSL_VERSION_CONFIG}"
         DESTINATION "${OSL_CONFIG_INSTALL_DIR}")
 
-install (FILES src/cmake/llvm_macros.cmake DESTINATION cmake)
 
-set (PERMISSION_FLAGS OWNER_EXECUTE OWNER_READ OWNER_WRITE
-                      GROUP_EXECUTE GROUP_READ
-                      WORLD_EXECUTE WORLD_READ)
-install (FILES src/build-scripts/serialize-bc.py
-         DESTINATION build-scripts
-         PERMISSIONS ${PERMISSION_FLAGS})
 
 # install targets files
