* ldlang.h (ldlang_add_undef): Add cmdline param.

	* ldlang.h (ldlang_add_undef): Add cmdline param.
	* ldlang.c (undef_from_cmdline): New var.
	(ldlang_add_undef): Add cmdline param.  Set undef_from_cmdline.
	(lang_end): Really require -e or -u from command line on
	relocatable --gc-sections.
	* ldemul.c (after_parse_default): Adjust ldlang_add_undef call.
	* ldgram.y (extern_name_list_body): Likewise.
	* lexsup.c (parse_args): Likewise.
	* emultempl/aix.em (gld${EMULATION_NAME}_read_file): Likewise.