some Maven build ports: pass JAVA_HOME to maven

When a port defines JAVA_VERSION but during the build multiple
jdk versions are installed, Maven does not always use the defined
version if JAVA_HOME is not set in the environment.

PR: 272855
Reviewed-by: https://lists.freebsd.org/archives/freebsd-java/2026-February/003537.html
Approved-by: java@