[foreign-memaccess+abi] RFR: Minor Windows build fixes [v2]

[Maurizio Cimadamore]

On Thu, 6 May 2021 21:08:32 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Some minor changes to fix build errors/warnings on Windows:
>> 
>> - Remove spurious `vprintf`  declaration in libStdLibTest.h (it is already included as part of stdio.h). This was causing an error due to a conflicting declaration.
>> - Remove `return` before free in benchmark lib. This was causing a warning that was then treated as an error.
>> 
>> Thanks,
>> Jorn
>
> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove libStdLibTest.h

Looks good!

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Marked as reviewed by mcimadamore (Committer).

PR: https://git.openjdk.java.net/panama-foreign/pull/528