hg: tsan/dev: Add a configure flag --<enable|disable>-tsan-launcher.

[manc at google.com]

Changeset: dc19f181c3b9
Author:    manc
Date:      2019-07-17 12:58 -0700
URL:       https://hg.openjdk.java.net/tsan/dev/rev/dc19f181c3b9

Add a configure flag --<enable|disable>-tsan-launcher.

This flag allows more control on whether to link TSAN runtime with launcher.
Default is consistent with whether the JVM feature "tsan" is enabled.

! make/autoconf/hotspot.m4