RFR: 8319197: Exclude hb-subset and hb-style from compilation

[Phil Race]

On Tue, 31 Oct 2023 21:32:26 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

> hb-subset and hb-style APIs are not used and not exported by libfontmanger. We can cut the compilation time by not compiling the unused files.
> 
> The added exclusions reduce the build time by ~1 minute (~8%) on my machine. This is with harfbuzz 8, with harfbuzz 7 the improvement was ~30 seconds.
> 
> Client libs tests continue to pass.

OK, let's just go with the exclusion at least for now.
If it becomes a problem on a subsequent upgrade it may need to be changed.
We can also explore other options later.

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Marked as reviewed by prr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16440#pullrequestreview-1716521585