RFR: 8269850: Most JDK releases report macOS version 12 as 10.16 instead of 12.0 [v2]

[Roger Riggs]

On Wed, 22 Sep 2021 17:41:18 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> The Mac OS specific code to determine the os.version property in java_props_macosx.c is updated
>> to replace the code extracting the version from the SystemVersion.plist by reading the version using t\
>> he hidden link:
>
> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Check for missing version from SystemVersion plist.
>   Refactor avoid repetition of conversion of NSString to char *.

Thanks for testing with Xcode 11.7. and MacOS 11.6.

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PR: https://git.openjdk.java.net/jdk/pull/5633