PatR b73e4815fa Guidebook.txt: silence groff complaints about CR ...

Don't attempt to switch to CR font (used to get fixed-width characters
when generating output that uses proportional width ones) when output
is already fixed-width (plain text).

The most recent release of groff (version 1.23) complains when a font
can't be found, then keeps going.  Earlier versions just silently kept
going.  Failing to load the CR font when already producing fixed-width
chars makes 'keep going' acceptable but the font-load-failure warnings
are a nuisance.

2023-11-01 21:35:56 -07:00

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