git: openjdk/jdk11u-dev: 8213922: fix ctw stand-alone build

[Aleksey Shipilev]

Changeset: c1deb0c4
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2021-07-06 17:48:59 +0000
URL:       https://git.openjdk.java.net/jdk11u-dev/commit/c1deb0c4c2349d5f9105b1756a845eeac921ae81

8213922: fix ctw stand-alone build

Reviewed-by: roland
Backport-of: e53852dd51f473587297c1631b2f07f594e43e0a

! test/hotspot/jtreg/testlibrary/ctw/Makefile