gcc/
Simplify config/avr/genmultilib.awk.
	* config/avr/t-avr (AWK) [t-multilib]: Remove "-v FORMAT=Makefile"
	command option from $(AWK) call.
	* config/avr/genmultilib.awk: Simplify and rewrite so that it
	generates MULTILIB_REQUIRED instead of MULTILIB_EXCEPTIONS.
	[FORMAT]: Remove handling of variable.
	* config/avr/t-multilib: Regenerate.

From-SVN: r248332