RFR: 8346719: Add relaunchers to the static JDK image for missing executables [v6]

[Magnus Ihse Bursie]

> In the static JDK image, a single humongous java executable is generated, and no other launcher, such as javac. This makes it impossible to run our jtreg tests, which assume these are present.
> 
> The solution is fortunately simply: we just need to add a bunch of trivial launchers, which are thin wrappers that execute the main java binary, with the proper arguments. This will result in the same behavior as the normal dynamic launchers, only that we will need to take the detour of launching another process instead of calling directly into the JLI library.

Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:

  Update based on review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24380/files
  - new: https://git.openjdk.org/jdk/pull/24380/files/41b5030b..0ba27090

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24380&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24380&range=04-05

  Stats: 41 lines in 3 files changed: 18 ins; 23 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24380.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24380/head:pull/24380

PR: https://git.openjdk.org/jdk/pull/24380