[ft] FREETYPE_PROPERTIES alternative?

[Volth]

Hello.

It is very sweet that with 2.7.1 release those who are upset with the
new default can return to the old ones by setting an environment
variable like FREETYPE_PROPERTIES="truetype:interpreter-version=35".
The problem is environment variable is not a truly global setting.
For example when you run a program using "sudo", it does not get
parent's environment variables.
And there never will be FREETYPE_PROPERTIES.

Please consider an alternative way to set FREETYPE_PROPERTIES
globally, via a file in /etc or something alternative to env var.