config.gcc: Add h8300-*-linux.

config.gcc: Add h8300-*-linux.

gcc/
	* config.gcc: Add h8300-*-linux.
	* config/h8300/linux.h: New.
	* config/h8300/t-linux: New.
	* config/h8300/h8300.c (h8300_option_override): Normal mode
	is not supported for h8300-*-linux.
	(h8300_file_start): Target priority change.
	(get_shift_alg): Likewise.
	(h8300_shift_need_scratch_p): Likewise.
	* config/h8300/h8300.h (TARGET_CPU_CPP_BUILTINS): Likewise.
	* config/h8300/h8300.md (define_peephole2): Remove duplicate condition.

libgcc/

	* config.host: Add h8300-*-linux
	* config/h8300/t-linux: New file.
	* config/h8300/lib1funs.s: Change symbol prefix.
	* config/h8300/sfp-machine.h: 64bit double support.

From-SVN: r222479