Revert "添加两个mac上的开发工具, 多道程序的放置与加载和运行完成"

This reverts commit aa8e42c7c4.

ch3-coop/os/Makefile

@@ -4,7 +4,7 @@ MODE := release
 KERNEL_ELF := target/$(TARGET)/$(MODE)/os
 KERNEL_BIN := $(KERNEL_ELF).bin
 SYMBOL_MAP := target/system.map
-QEMU_CMD_PATH := ../../tools/qemu-system-riscv64
+QEMU_CMD_PATH := /Users/zhangxinyu/Downloads/qemu-7.0.0/build/qemu-system-riscv64
 QEMU_PID = $(shell ps aux | grep "[q]emu-system' | awk '{print $$2}")
 OBJDUMP := rust-objdump --arch-name=riscv64
 OBJCOPY := rust-objcopy --binary-architecture=riscv64