RFR: 7903160: Run self-tests for jtreg on MacOS and Windows [v10]

[Christian Stein]

On Fri, 15 Apr 2022 16:27:58 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Install more Cygwin packages
>
> make/CheckJavaOSVersion.java line 37:
> 
>> 35:     private static void checkJavaOSVersion(String expectVersion) {
>> 36:         String osVersion = System.getProperty("os.version");
>> 37:         if (!osVersion.startsWith(expectVersion)) {
> 
> This change seems questionable.
> 
> `os.version` is supposed to reflect (`.equals`) the OS version. We should at least understand why it is being reporting as a leading substring.   
> Instead of `.startsWith`, consider `.matches` with a pattern that allows optional trailing dotted digits.

Could be related to https://bugs.openjdk.java.net/browse/JDK-8269850

The [error message](https://github.com/openjdk/jtreg/runs/6034597187?check_suite_focus=true#step:6:197) reported in the logs reads:

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PR: https://git.openjdk.java.net/jtreg/pull/75