git: 9front

ref: f4e52194f238dd3fc70a2f7b3c7eb73261c39f2a
dir: /sys/src/cmd/spin/README/

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the latest version of spin is always
available via:
	http://spinroot.com/spin/whatispin.html

to make the sources compile with the mkfile on Plan 9
the following changes were made:

	omitted memory.h from spin.h
	changed /lib/cpp to /bin/cpp in main.c
	simplified non_fatal() in main.c to remove
	use of yychar