Patch to make groff PAGE settable in make.conf

[Steve O'Hara-Smith]

	The attached rather trivial patch makes the groff build pick up a
preset PAGE variable if it exists so that groff can for example be built
and installed for A4[1] by default in European countries.

	If it seems to be a good idea I'll work up a patch for the
make.conf manpage and /etc/defaults/make.conf documenting the PAGE variable.

[1] I finally got fed up with changing it by hand every time I do an
installworld :)

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Attachment:
groff.patch
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