RFR: 7903206: Support MSYS2 for building jtreg on Windows

[Christian Stein]

On Thu, 9 Jun 2022 08:31:59 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> 7903206: Support MSYS2 for building jtreg on Windows
>
> 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..._

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