c-decl.c (pushdecl): Only put decls which finish_struct will do something about onto incomplete chain.

	* c-decl.c (pushdecl): Only put decls which finish_struct will do
	something about onto incomplete chain.
	(finish_struct): If not removing type from incomplete
	list, update prev.

	* gcc.dg/20030815-1.c: New test.

From-SVN: r70752