8256501: libTestMainKeyWindow fails to build with Xcode 12.2

[VladimirKempik]

Backport-of: 4e5116c46e29977cccbe8c04cb5559ce345fa72e

A very simple and safe fix, a prerequest for JNF removal to apply more cleanly.
JavaVM is a pseudo framework for a long time already, linking with it has no meaning.

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Progress

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Issue

• JDK-8256501: libTestMainKeyWindow fails to build with Xcode 12.2

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk15u-dev pull/6/head:pull/6
$ git checkout pull/6

Update a local copy of the PR:
$ git checkout pull/6
$ git pull https://git.openjdk.java.net/jdk15u-dev pull/6/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 6

View PR using the GUI difftool:
$ git pr show -t 6

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk15u-dev/pull/6.diff

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

@VladimirKempik This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8256501: libTestMainKeyWindow fails to build with Xcode 12.2

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[mlbridge]

Webrevs

• 00: Full (80935240)

[VladimirKempik]

/integrate

[openjdk]

@VladimirKempik Pushed as commit c565a2b.

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