Fix #7754 - Allow JETTY_SYS_PROPS to be configured by /etc/default/

[joakime]

Signed-off-by: Joakim Erdfelt joakim.erdfelt@gmail.com

[joakime]

Wow, the JDK-17 build core dumped ...

[INFO] --- spotbugs-maven-plugin:4.6.0.0:spotbugs (spotbugs) @ jetty-util ---
[INFO] Fork Value is false
     [java] JVM args ignored when same JVM is used.
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f48e9e10293, pid=3550517, tid=3551682
#
# JRE version: OpenJDK Runtime Environment Temurin-17.0.2+8 (17.0.2+8) (build 17.0.2+8)
# Java VM: OpenJDK 64-Bit Server VM Temurin-17.0.2+8 (17.0.2+8, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0xe2f293]  PhaseIdealLoop::spinup(Node*, Node*, Node*, Node*, Node*, small_cache*) [clone .part.42]+0x53
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport %p %s %c %d %P %E" (or dumping to /home/jenkins/agent/workspace/jetty.project_PR-7819/core.3550517)
#
# An error report file with more information is saved as:
# /home/jenkins/agent/workspace/jetty.project_PR-7819/hs_err_pid3550517.log
#
# Compiler replay data is saved as:
# /home/jenkins/agent/workspace/jetty.project_PR-7819/replay_pid3550517.log
#
# If you would like to submit a bug report, please visit:
#   https://github.com/adoptium/adoptium-support/issues
#

Aborted (core dumped)