RFR: 8345507: Fix build of static launcher

[Magnus Ihse Bursie]

Unfortunately, [JDK-8339480](https://bugs.openjdk.org/browse/JDK-8339480) as checked in does not work.

One of the very last review updates of [JDK-8339480](https://bugs.openjdk.org/browse/JDK-8339480) was a rename of a make variable. Since this seemed trivial to me, I did not re-test the code after making this change. That was my second mistake. My first mistake was to not discover that this variable was in fact used in another place, so a crucial test never passes and the code does not work.

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Commit messages:
 - 8345507: Fix build of static launcher

Changes: https://git.openjdk.org/jdk/pull/22551/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22551&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345507
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22551.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22551/head:pull/22551

PR: https://git.openjdk.org/jdk/pull/22551