RFR: 8352044: Add --with-import-jvms to configure

[Aleksey Shipilev]

On Fri, 14 Mar 2025 15:49:44 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> We should allow pre-built JVMs to be included in a build, so they are just copied into place, and the jvm.cfg file properly updated.

This change copies `libjvm.so` _and_ sibling `.jsa` files, right?

If so, then one thing is missing: regenerating CDS archives that have opinions on `modules` filesizes/dates for fingerprinting their CDS archives. My frankensteining scripts do that by invoking new JVM explicitly with `-Xshare:dump`. But build system should already know how to do that, as it does it at the end of the build.

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PR Review: https://git.openjdk.org/jdk/pull/24063#pullrequestreview-2686128808