RFR: 8352506: Simplify make/test/JtregNativeHotspot.gmk

[Erik Joelsson]

On Thu, 20 Mar 2025 12:32:53 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> The file to setup special arguments to native JTReg Hotspot tests is needlessly complicated. With some generalisation, we can make it much simpler.

I think this is ok, but I would like someone with familiarity with these tests to comment on if adding all include dirs to all tests is a good idea.

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Marked as reviewed by erikj (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24130#pullrequestreview-2703466200