build: add a "user" arch to allow the kernel to run as a program on the host machine

tools/make/gcc-cross-compile.mk

@@ -1,10 +0,0 @@
-LD  := $(ARCH)-elf-gcc
-CC  := $(ARCH)-elf-gcc
-ASM := $(ARCH)-elf-gcc
-OBJCOPY := $(ARCH)-elf-objcopy
-STRIP := $(ARCH)-elf-strip
-
-CFLAGS   := -ffreestanding -nostdlib
-ASMFLAGS := $(CFLAGS)
-LDFLAGS  := -nostdlib
-