RFR: JDK-8311285: report some fontconfig related environment variables in hs_err file [v2]

[Matthias Baesken]

> 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.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  add FONTCONFIG_USE_MMAP

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14767/files
  - new: https://git.openjdk.org/jdk/pull/14767/files/76583497..4d19b2d7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14767&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14767&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14767.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14767/head:pull/14767

PR: https://git.openjdk.org/jdk/pull/14767