Add QEMUEXTRA environment to add extra QEMU arguments, like in JOS
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			@ -201,7 +201,7 @@ QEMUGDB = $(shell if $(QEMU) -help | grep -q '^-gdb'; \
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ifndef CPUS
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CPUS := 2
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endif
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QEMUOPTS = -hdb fs.img xv6.img -smp $(CPUS) -m 512
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QEMUOPTS = -hdb fs.img xv6.img -smp $(CPUS) -m 512 $(QEMUEXTRA)
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qemu: fs.img xv6.img
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	$(QEMU) -serial mon:stdio $(QEMUOPTS)
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