RFR: 8338851: Hoist os::Posix::realpath() to os::realpath() and implement on Windows [v22]

[duke]

On Wed, 16 Oct 2024 13:17:48 GMT, Simon Tooke <stooke at openjdk.org> wrote:

>> This PR changes the status of realpath() from a Posix-specific API to a globally available API, i.e. adding it to the "Hotspot Porting API".  Code would refer to os::realpath() instead of os::Posix::realpath().
>> 
>> This requires a Windows implementation of realpath(), using Windows _fullpath(), and renaming os::Posix::realpath() to os::realpath().
>> 
>> The main difference between POSIX and Windows behaviour is that POSIX actually requires an existing accessible file, while Windows will happily work with made-up filenames.
>> 
>> Please note that guidelines for doing this appear in src/hotspot/share/runtime/os.hpp
>
> Simon Tooke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   clean up whitespace error

@stooke 
Your change (at version 1467917002d5efd11ebbdb8825cb0e4789b9225c) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/20683#issuecomment-2418745864