RFR: JDK-8303476: Add the runtime version in the release file of a JDK image

[Mandy Chung]

On Wed, 1 Mar 2023 20:28:14 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> `$JAVA_HOME/release` file currently includes `JAVA_VERSION`  which is the version 
> number plus the pre-release identifier for example "21-ea".    The build number 
> and additional build information are useful in identifying the information 
> about a JDK image but not available.  This proposes to add a new entry in the release file:
> 
> JAVA_RUNTIME_VERSION="$(VSTR)"
> 
> where `$(VSTR)` is the string represented by `Runtime::version()`.

Can you also review CSR?  thanks.

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PR: https://git.openjdk.org/jdk/pull/12813