- Compile with clang (reduces package size by 143 MB)
- Include optional ZGC garbage collector
- Enable base hotspot test suite
- If $HOME is unavailable, use the current directory for user prefs (avoids errors within solbuild)
- Don't echo the value of _JAVA_OPTIONS to console if it's set in the environment
These changes drop the main openjdk-11 package size from 396.6 MB to 253.6 MB.