* Makefile.am: Remove old (before GCC 3.3) emulations for AVR

	* Makefile.am: Remove old (before GCC 3.3) emulations for AVR
	target: avr1200, avr23xx, avr4433, avr44x4, avr85xx, avrmega103,
	avrmega161, avrmega603.  Default to avr2.
	* Makefile.in: Regenerate.
	* configure.tgt: Likewise.
	* emulparams/avr1200.sh: Remove.
	* emulparams/avr23xx.sh: Remove.
	* emulparams/avr4433.sh: Remove.
	* emulparams/avr44x4.sh: Remove.
	* emulparams/avr85xx.sh: Remove.
	* emulparams/avrmega103.sh: Remove.
	* emulparams/avrmega161.sh: Remove.
	* emulparams/avrmega603.sh: Remove.
	* scripttempl/elf32avr.sc: Remove.