[groff] Upgrade to 1.22.4 breaks PDF font

[Richard Morse]

Hi! I just upgraded to groff 1.22.4, and suddenly my files are not turning into PDFs properly. The 
error is "can't find font NR" (and "NI"). This is on Mac OS X 10.13, with the 
groff installed by Homebrew.

Looking at /usr/local/share/groff/1.22.4/font/devpdf, especially when comparing it with devps, 
shows that there are many fewer fonts for the PDF than for the PS device (which I don't think is 
supposed to happen). The "NR" and "NI" fonts were definitely there in 1.22.3.

I tried searching to see if this was a known change, but it wasn't listed 
(unless it was somehow implied by some other change) in the change notes, and 
searches online didn't seem to find much.

Was this supposed to happen? Is this something unique to Homebrew? Is there an 
easy fix?

Tanks,
Ricky