RFR: 7904048: Update jtreg to use Ant 1.10.15

[Christian Stein]

On Wed, 25 Jun 2025 12:07:09 GMT, Christian Stein <cstein at openjdk.org> wrote:

> Please review this update to make jtreg use Ant 1.10.15

The `build.sh` scripts in

 - [jtharness/build.sh](make/build-support/jtharness/build.sh)
 - [build-support/build-common.sh](make/build-support/build-common.sh)

seem to prefer an Ant installation that is pre-installed.


compile.classes:
     [echo] =================================================================
     [echo] jdk.builder.home set to /opt/hostedtoolcache/Java_jdkfile_jdk/21/x64
     [echo] =================================================================
     [echo] Using ant.version=Apache Ant(TM) version 1.10.14 compiled on September 25 2023
     [echo] Using ant.home=/usr/share/ant
     [echo] Using ant.java.version=21
     [echo] Using java.home=/opt/hostedtoolcache/Java_jdkfile_jdk/21/x[64](https://github.com/sormuras/jtreg/actions/runs/15875859852/job/44763174191#step:4:65)
     [echo] =================================================================


Leads to no issue, yet...

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PR Comment: https://git.openjdk.org/jtreg/pull/270#issuecomment-3004605317