* g++.dg/compat/struct-layout-1.exp: Do not link with libiberty.
	* g++.dg/compat/struct-layout-1_generate.c (config.h): Do not include.
	(limits.h): Include unconditionally.
	(stdlib.h): Likewise.
	(hashtab.h): Do not include.
	(getopt.h): Likewise.
	(stddef.h): Include.
	(hashval_t): Define.
	(struct entry): Add "next" field.
	(HASH_SIZE): New macro.
	(hash_table): New variable.
	(switchfiles): Do not use xmalloc.
	(mix): New macro.
	(iterative_hash): New function.
	(hasht): Remove.
	(e_exists): New function.
	(e_insert): Likewise.
	(output): Use, instead of libiberty hashtable functions.
	(main): Do not use getopt.  Do not call htab_create.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r108461