Today if `libffi` cannot allocate pages of memory which are both
writeable and executable then it will attempt to write code to a
temporary file. Elasticsearch configures itself a suitable temporary
directory for use by JNA but by default `libffi` won't find this
directory and will try various other places. In certain configurations,
none of the other places that `libffi` tries are suitable. With older
versions of JNA this would result in a `SIGSEGV`; since #80617 the JVM
will exit with an exception.
With this commit we use the `LIBFFI_TMPDIR` environment variable to
configure `libffi` to use the same directory as JNA for its temporary
files if they are needed.
Closes#18272Closes#73309Closes#74545Closes#77014Closes#77053
Relates #77285
Co-authored-by: Rory Hunter <roryhunter2@gmail.com>
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