RFR: JDK-8311285: report some fontconfig related environment variables in hs_err file

[Christoph Langer]

On Tue, 4 Jul 2023 11:47:49 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> There are a number of important environment variables influencing how fontconfig works.
> See for example
> https://man.archlinux.org/man/fonts-conf.5
> Some of them should be added to the list of reported environment variables in hs_err file because e.g. a bad setting for some of them can even lead sometimes to crashes.

This looks like useful additions, I'd also vote for adding FONTCONFIG_USE_MMAP.

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Marked as reviewed by clanger (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14767#pullrequestreview-1518272552