bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'

[Alexander Shukaev]

/usr/share/fonts/TTF/AdobeBlank-Regular.ttf is owned by 
ttf-google-fonts-git 20171026-1

I will try updating it now and see if it fixes the issue.  However, even 
if it does, I have a bunch of follow-up questions:

1.  How to protect Emacs from having that issue again regardless of 
broken/out-dated fonts?  Can I somehow, for example, exclude such fonts 
from consideration by Emacs?
2.  Why was this font queried at all in the first place?  I don't use 
this font.