git: openjdk/jtreg: 7903104: Remove secondary Ant build system

[Jonathan Gibbons]

Changeset: e57e9e49
Author:    Jonathan Gibbons <jjg at openjdk.org>
Date:      2022-02-16 01:07:22 +0000
URL:       https://git.openjdk.java.net/jtreg/commit/e57e9e494d2db0dd5cfc42c790cbe92d7d31e0f5

7903104: Remove secondary Ant build system

Reviewed-by: iris

! README.md
- make/build.properties
- make/build.xml
- make/netbeans/jtreg/nbproject/project.xml