Long double support on m68k

[Andrew Cagney]

> This patch enables long double support for m68k.
> 
> Andreas.
> 
> 2001-07-23  Andreas Schwab  <schwab@suse.de>
> 
> * config/m68k/tm-m68k.h (TARGET_LONG_DOUBLE_FORMAT): Define.
> 	(TARGET_LONG_DOUBLE_BIT): Define.
> 	(REGISTER_VIRTUAL_SIZE): Return 12 for floating point registers.
> 	(MAX_REGISTER_VIRTUAL_SIZE): Increase to 12.
> 	(REGISTER_VIRTUAL_TYPE): Return builtin_type_long_double for
> 	floating point registers.
> 	(REGISTER_CONVERTIBLE, REGISTER_CONVERT_TO_VIRTUAL,
> 	REGISTER_CONVERT_TO_RAW): Remove.
> 	* config/m68k/xm-linux.h (HOST_LONG_DOUBLE_FORMAT): Define.


The patch changes something included by all the other config/m68k/tm-*.h 
header files.  Can you explain why it won't break some of those targets.

	Andrew