added workarounds so freshly built jdk can set its necessary source/taret without touching ant/makefile. In addition it can set itself as compiler/runner without putting itself on path.
------------- Commit messages: - 8323170 - j2dbench is using outdated javac source/target to be able to build by itself Changes: https://git.openjdk.org/jdk/pull/17695/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17695&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8323170 Stats: 49 lines in 3 files changed: 43 ins; 0 del; 6 mod Patch: https://git.openjdk.org/jdk/pull/17695.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/17695/head:pull/17695 PR: https://git.openjdk.org/jdk/pull/17695
