RFR: 8349467: INIT_TARGETS tab completions on "make" lost with JDK-8348998

[Erik Joelsson]

On Wed, 2 Apr 2025 20:38:48 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> [JDK-8348998](https://bugs.openjdk.org/browse/JDK-8348998) broke tab completion for all init targets, i.e. `print-modules print-targets print-configuration print-tests reconfigure pre-compare-build post-compare-build`, of which `reconfigure` was probably the hardest hit.
> 
> The solution is to move the declaration of ALL_INIT_TARGETS so it is available even for the `SKIP_SPEC=true` part of PreInit.gmk.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24392#pullrequestreview-2741931700