RFR: 8322309: Fix an inconsistancy in spacing style in spec.gmk.template

Tue Dec 19 13:05:47 UTC 2023

On Mon, 18 Dec 2023 17:06:51 GMT, Frederic Thevenet <fthevenet at openjdk.org> wrote:

> [JDK-8320763](https://bugs.openjdk.org/browse/JDK-8320763) fixed the consistency of spaces around the assignment operators in spec.gmk.in (as it was called then).
> Unfortunately [JDK-8321374](https://bugs.openjdk.org/browse/JDK-8321374) re-introduced one such inconsistency and so this follow-up aims to fix this.

Looks good (and trivial).

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Marked as reviewed by sgehwolf (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17149#pullrequestreview-1788823609