libmach: add le mips
 [rsc] --rw-rw-r-- M 391777 glenda sys 16172 Apr  5 13:03 sys/src/libmach/executable.c
	/n/sourcesdump/2006/0405/plan9/sys/src/libmach/executable.c:71,79 - 
	/n/sourcesdump/2006/0406/plan9/sys/src/libmach/executable.c:71,88
	  ExecTable exectab[] =
	  {
	  	{ V_MAGIC,			/* Mips v.out */
	- 		"mips plan 9 executable",
	- 		"mips plan 9 dlm",
	+ 		"mips plan 9 executable BE",
	+ 		"mips plan 9 dlm BE",
	  		FMIPS,
	+ 		1,
	+ 		&mmips,
	+ 		sizeof(Exec),
	+ 		beswal,
	+ 		adotout },
	+ 	{ P_MAGIC,			/* Mips 0.out (r3k le) */
	+ 		"mips plan 9 executable LE",
	+ 		"mips plan 9 dlm LE",
	+ 		FMIPSLE,
	  		1,
	  		&mmips,
	  		sizeof(Exec),