git: openjdk/jdk21u: master: 8318669: Target OS detection in 'test-prebuilt' makefile target is incorrect when running on MSYS2

[Aleksey Shipilev]

Changeset: e371a3d9
Author:    Frederic Thevenet <fthevenet at openjdk.org>
Committer: Aleksey Shipilev <shade at openjdk.org>
Date:      2023-11-02 09:02:59 +0000
URL:       https://git.openjdk.org/jdk21u/commit/e371a3d92feee932abe1906802df0d5578d9c1ba

8318669: Target OS detection in 'test-prebuilt' makefile target is incorrect when running on MSYS2

Backport-of: 202c0137b86cd7bcbe0c1eddf2657f45698ab667

! make/RunTestsPrebuilt.gmk