Build pytorch_android using Gradle wrapper. (#51067)
Summary:
[Here](https://docs.gradle.org/current/userguide/gradle_wrapper.html), there is the following description.
`The recommended way to execute any Gradle build is with the help of the Gradle Wrapper`
I took a little time to prepare Gradle for `pytorch_android` build. (version etc.)
I think using Gradle wrapper will make `pytorch_android` build more seamless.
Gradle wrapper version: 4.10.3
https://github.com/pytorch/pytorch/blob/250c71121b8ac2ef1899a2414c939d4d45fc2be4/.circleci/scripts/build_android_gradle.sh#L13
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51067
Reviewed By: izdeby
Differential Revision: D26315718
Pulled By: IvanKobzarev
fbshipit-source-id: f8077d7b28dc0b03ee48bcdac2f5e47d9c1f04d9
