unneeded .cvsignore

[Stephen J. Turnbull]

>>>>> "SY" == Steve Youngs <steve at youngs.au.com> writes:

    SY> * Stephen J Turnbull <stephen at xemacs.org> writes:

    >> Hm.  I wonder if .cvsignore could usefully be generated from
    >> the Makefile?

    SY> What would be the point of doing that?  Especially in this
    SY> case where it would seem the file is no longer needed.

# makefile

GENERATED=hyperspec.html

.cvsignore:
	echo $(GENERATED) > .cvsignore

Guess what happens when hyperspec.html gets removed from the GENERATED
variable?  This is much more likely to get updated correctly than
.cvsignore itself is.

However, I don't know if this works reasonably in corner cases.

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