RFR: 8171508: Remove -Dsun.java.launcher.is_altjvm option [v3]

[David Holmes]

On Thu, 3 Apr 2025 22:39:07 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> This change fixes two issues in `os::jvm_path()`:
>> 
>> - go back 4 instead of 5 slashes and then checking for "/jre/lib";
>> - fix the hardcoded "hotspot" sub-directory before the jvm library name.
>> 
>> Passed tiers 1 - 3 testing.
>
> Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:
> 
>   @dholmes-ora comment

Also as discussed offline picking up JAVA_HOME from the environment is not the right thing to do in general. It only worked with -Dsun.java.launcher.is_altjvm because we ensured we set JAVA_HOME when using the property.

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PR Comment: https://git.openjdk.org/jdk/pull/24310#issuecomment-2781695926