Use variadic macros with avr-log.c.

Use variadic macros with avr-log.c.

	* config/avr/avr-protos.h (avr_vdump): New prototype.
	(avr_log_set_caller_e, avr_log_set_caller_f): Remove protos.
	(avr_edump, avr_fdump, avr_dump): (Re)define to use avr_vdump.
	* config/avr/avr-log.c: Adjust comments.
	(avr_vdump): New function.
	(avr_vadump): Pass caller as 2nd argument instead of format string.
	(avr_log_caller, avr_log_fdump_e, avr_log_fdump_f)
	(avr_log_set_caller_e, avr_log_set_caller_f): Remove.

From-SVN: r220962