* ldemul.h (ldemul_unrecognized_file): Declare.

	* ldemul.h (ldemul_unrecognized_file): Declare.
	(ldemulation_xfer_type): Add unrecognized_file field.
	* ldemul.c (ldemul_unrecognized_file): New function.
	* ldlang.c (load_symbols): If a file can not be recognized, call
	ldemul_unrecognized_file before trying it as a linker script.
	* aix.em (gld${EMULATION_NAME}_unrecognized_file): New static
	function.
	(gld${EMULATION_NAME}_read_file): Use FOPEN_RT, not "r".
	(ld_${EMULATION_NAME}_emulation): Initialize unrecognized_file.