[jdk26] RFR: 8374642: EscapeHash macro fails with GNU make 4.3 and 4.4

[Iris Clark]

On Wed, 7 Jan 2026 21:57:23 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> This pull request contains a backport of commit [383fe1ef](https://github.com/openjdk/jdk/commit/383fe1efc3a23385b8576e20f458f91085c6325e) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Erik Joelsson on 7 Jan 2026 and was reviewed by Tim Bell and Aleksey Shipilev.

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29099#pullrequestreview-3637400553