git: openjdk/loom: fibers: Get rid of trackAllVThreads. No longer used.

[duke]

Changeset: 8ca65973
Author:    Chris Plummer <chris.plummer at oracle.com>
Date:      2022-02-25 22:28:13 +0000
URL:       https://git.openjdk.java.net/loom/commit/8ca659738da22524d8bb46854a9eac7f15a6572d

Get rid of trackAllVThreads. No longer used.

! src/jdk.jdwp.agent/share/native/libjdwp/debugInit.c
! src/jdk.jdwp.agent/share/native/libjdwp/util.h