This is a program to rewrite C preprocessor output (a .i file) in-place
to convert labeled control structure, which is not standard C, to
semantically equivalent (but significantly less programmer-friendly)
constructs which are standard C.

The argument is the .i file to be rewritten.

Manual usage would look like

	cc -E -o foo.i foo.c
	lcs-cvt foo.i
	cc -c -o foo.o foo.i
	rm foo.i

A few of my programs which need lcs-cvt have the Makefile set up to run
it automatically, but some don't.