RFR: 8361216: Do not fork javac in J2DBench ant build

[Eric Caspole]

On Tue, 1 Jul 2025 19:30:21 GMT, Eric Caspole <ecaspole at openjdk.org> wrote:

> Build J2DBench in ant using JAVA_HOME, not using fork to possibly pick a different javac from the PATH.

We only test back to 8 so we don't need to change it more often. But JDK 24/25 does not support source 7 so we should do something. I think JAVA_HOME with ant is simpler than specifying lots of vars to makefile but I don't have strong opinion.

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PR Comment: https://git.openjdk.org/jdk/pull/26077#issuecomment-3029179400