RFR: JDK-8285730: unify _WIN32_WINNT settings [v4]

[David Holmes]

On Wed, 11 May 2022 16:00:32 GMT, Maxim Kartashev <mkartashev at openjdk.org> wrote:

>> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   adjust API level to Windows 8 for security.cpp and do some cleanup
>
> This change seem to have made this group of declarations obsolete: 
> `src/java.desktop/windows/native/libawt/windows/awt_Toolkit.h:157` (follow the [link](
> https://github.com/openjdk/jdk/blob/89de756ffbefac452c7df559e2a4eb50bf71368b/src/java.desktop/windows/native/libawt/windows/awt_Toolkit.h#L157)). Does anyone have plans to drop those? Have any bugs been filed for that? If not, I'll attend to that myself.

@mkartashev  all references to WINVER in the AWT code seem obsolete. Possibly most of the IS_WINxxx usages could also be replaced.

-------------

PR: https://git.openjdk.java.net/jdk/pull/8428