PR c/36507
	* c-decl.c (merge_decls): Don't clear DECL_EXTERNAL for
	nested inline functions.
	(start_decl, start_function): Don't invert DECL_EXTERNAL
	for nested inline functions.

	* gcc.dg/inline-28.c: New test.
	* gcc.dg/inline-29.c: New test.
	* gcc.dg/inline-30.c: New test.

From-SVN: r136745