Switch external remote ant builder for ant.ui to supported JRE version

[iloveeclipse]

See #2776 and #1905

Ant support in Eclipse requires Java 17, the remote builder launch config still used 11 which resulted in errors on clean build of the project.

eclipse.buildId=4.41.0.I20260712-2300
java.version=25
java.vendor=Eclipse Adoptium
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Command-line arguments:  -os linux -ws gtk -arch x86_64 -data file:/data/4x_platform_workspace/

org.eclipse.core.externaltools
Error
Mon Jul 13 08:58:45 CEST 2026
Errors running builder 'Integrated External Tool Builder' on project 'org.eclipse.ant.ui'.

org.eclipse.core.runtime.CoreException: JRE version less than 17 is not supported. 
	at org.eclipse.ant.internal.launching.launchConfigurations.AntLaunchDelegate.launch(AntLaunchDelegate.java:138)
	at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:790)
	at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:701)
	at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:696)
	at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.launchBuild(ExternalToolBuilder.java:188)
	at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.doBuildBasedOnScope(ExternalToolBuilder.java:176)
	at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.build(ExternalToolBuilder.java:95)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:1146)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:303)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:363)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:486)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:489)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:601)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:549)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:631)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:208)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:309)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

[github-actions]

Test Results

    54 files  ±0      54 suites  ±0   54m 35s ⏱️ - 5m 39s
 4 687 tests ±0   4 665 ✅ ±0   22 💤 ±0  0 ❌ ±0 
11 955 runs  ±0  11 802 ✅ ±0  153 💤 ±0  0 ❌ ±0 

Results for commit 85bdb5a. ± Comparison against base commit b2ec9aa.

[iloveeclipse]

The build failure is unrelated, see #2812