[foreign-jextract] RFR: Fix some jextract test failures on Windows

[Maurizio Cimadamore]

On Wed, 6 May 2020 14:25:05 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Hi,
> 
> This PR fixes some jextract test failure I was seeing locally, caused by use of `long` which has a different
> size/carrier type on Windows.
> MSVC also doesn't allow redefining `size_t` in a typedef, so I've changed the name of that.
> 
> Thanks,
> Jorn

Marked as reviewed by mcimadamore (Committer).

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PR: https://git.openjdk.java.net/panama-foreign/pull/150