Add MIPS64 port about luajit HOT 6 CLOSED

....
lj_arch.h:412:2: error: #error "No support for MIPS64"
 #error "No support for MIPS64"
  ^
HOSTCC    host/minilua.o
HOSTLINK  host/minilua
lj_arch.h:412:2: error: #error "No support for MIPS64"
 #error "No support for MIPS64"
  ^
DYNASM    host/buildvm_arch.h
HOSTCC    host/buildvm.o
In file included from host/buildvm.c:67:0:
./../dynasm/dasm_mips.h: In function ‘dasm_encode’:
./../dynasm/dasm_mips.h:359:15: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
      n = (n + (int)base) & 0x0fffffff;
               ^
HOSTCC    host/buildvm_asm.o
HOSTCC    host/buildvm_peobj.o
HOSTCC    host/buildvm_lib.o
HOSTCC    host/buildvm_fold.o
HOSTLINK  host/buildvm
BUILDVM   lj_vm.S
Error: pointer size mismatch in cross-build.
Try: make HOST_CC="gcc -m32" CROSS=...

Makefile:641: recipe for target 'lj_vm.S' failed
make[1]: *** [lj_vm.S] Error 1