8361142: Improve custom hooks for makefiles

[magicus]

Add some additional and more fine-grained way in which custom makefiles can be integrated.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8361142: Improve custom hooks for makefiles (Enhancement - P3)

Reviewing

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$ git fetch https://git.openjdk.org/jdk.git pull/26060/head:pull/26060
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Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk.git pull/26060/head

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$ git pr checkout 26060

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https://git.openjdk.org/jdk/pull/26060.diff

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[openjdk]

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[mlbridge]

Webrevs

• 00: Full (2b3ed760)