git: openjdk/jtreg: 7902966: jtreg does not build with JDK 11

[Jonathan Gibbons]

Changeset: 6583a8c6
Author:    Jonathan Gibbons <jonathan.gibbons at oracle.com>
Date:      2021-06-09 18:27:03 +0000
URL:       https://git.openjdk.java.net/jtreg/commit/6583a8c6b1dd1b9ac310196bccb18de8502603ee

7902966: jtreg does not build with JDK 11

! make/Defs.gmk
! make/jtreg.gmk
! test/classIsolation/ClassIsolationTest.gmk
! test/javac/JavacTests.gmk
! test/refIgnoreLines/RefIgnoreLines.gmk
! test/rerun2/RerunTest2.gmk
! test/vmopts/TestVMOpts.gmk