Remove -flto-partition=none for Linux LTO builds

Author: Fidget-Spinner

configure

@@ -2031,7 +2031,7 @@ if test "$Py_LTO" = 'true' ; then
           LTOCFLAGS="-flto"
           ;;
         *)
-          LTOFLAGS="-flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none"
+          LTOFLAGS="-flto=auto -fuse-linker-plugin -ffat-lto-objects"
           ;;
       esac
       ;;