RFR: 7903206: Support MSYS2 for building jtreg on Windows

[Christian Stein]

On Thu, 9 Jun 2022 08:40:49 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> make/Defs.gmk line 59:
>> 
>>> 57: endif
>>> 58: 
>>> 59: ifneq (,$(findstring MSYS,$(SYSTEM_UNAME)))
>> 
>> Look for MINGW as well; depending on how MSYS2 is configured, it can present itself as MSYS, MINGW32 or MINGW64 (the default).
>
> Good catch.
> 
> Any idea if `findstring` supports logical OR operation? _Looking for its man page..._

Addressed via https://github.com/openjdk/jtreg/pull/87/commits/3919f80869f46d73a6744fb052e03366e030c23b

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PR: https://git.openjdk.java.net/jtreg/pull/87