RFR: 8368312: Move CC_OUT_OPTION out of spec.gmk

[Erik Joelsson]

On Mon, 22 Sep 2025 16:35:49 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> The CC_OUT_OPTION is a bit tricky, since it tries to encode a literal space from configure. Fortunately, it is only used in a single place, so we can just define it in place instead.
> 
> This is part of an effort to clean up spec.gmk to not contain so much weird stuff.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27431#pullrequestreview-3254602379