[jfx11u] RFR: 8263760: Update gradle to version 7.0.1 [v2]

[Kevin Rushforth]

On Sun, 22 Aug 2021 11:32:58 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

>> There were two minor merge conflicts in `build.gradle` and one conflict in `gradle/wrapper/gradle-wrapper.properties` while cherry picking the change. 
>> And it also required similar changes to be made for project fxpackager. The [first commit](https://github.com/openjdk/jfx11u/pull/49/commits/7700a6d1a7c82df8fc269f1de6f3bd5119fb3397) is the original cherry pick and [second commit](https://github.com/openjdk/jfx11u/pull/49/commits/cea09bdfc96374ce00560c13e6730ab76f8b20e9) is the additional changes for fxpackager.
>> Verified the build on all three platforms with gradle 7.0.1 and apache ant 1.10.5
>
> Ambarish Rapte has updated the pull request incrementally with one additional commit since the last revision:
> 
>   use antpluginImplementation

Thanks.

> We might remove the fxpackager part, but it doesn't hurt being there either.

Since they aren't being built (and might no longer be buildable), we could consider backporting [JDK-8203379](https://bugs.openjdk.java.net/browse/JDK-8203379) to jfx11u remove the sources in a future update release. As it is, these sources serve no purpose other than as a source of "technical debt".

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PR: https://git.openjdk.java.net/jfx11u/pull/49