Merge pull request #5218 from martin-frbg/lapacke_mangling

lapacke_mangling.h is no longer generated, so don't delete on make clean

Makefile

@@ -452,7 +452,7 @@ endif
 	@rm -f cblas.tmp cblas.tmp2
 	@touch $(NETLIB_LAPACK_DIR)/make.inc
 	@$(MAKE) -C $(NETLIB_LAPACK_DIR) clean
-	@rm -f $(NETLIB_LAPACK_DIR)/make.inc $(NETLIB_LAPACK_DIR)/lapacke/include/lapacke_mangling.h
+	@rm -f $(NETLIB_LAPACK_DIR)/make.inc
 	@$(MAKE) -C relapack clean
 	@rm -f *.grd Makefile.conf_last config_last.h
 	@(cd $(NETLIB_LAPACK_DIR)/TESTING && rm -f x* *.out testing_results.txt)