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

[Naoto Sato]

On Wed, 22 Sep 2021 15:00:59 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:

src/java.base/macosx/native/libjava/java_props_macosx.c line 270:

> 268:                              @"/System/Library/CoreServices/.SystemVersionPlatform.plist"];
> 269:             if (version != NULL) {
> 270:                 NSString *nsVerStr = [version objectForKey : @"ProductVersion"];

Should we check `nsVerStr != NULL` here?

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