Issue with gradleArg parameter not being used when created gradle wrapper

# Bug Report

## Problem

gradleArg is not being passed to the gradle command when it is creating the wrapper and I was using gradleArg=--project-cache-dir=/tmp because my project directory is on a Windows file server. If I ran the gradle command manually with my --project-cache-dir everything worked fine, but I could not build using the cordova command directly.

### What is expected to happen?
Extra gradle arguments are passed through the command line to gradle using cordova commands.

### What does actually happen?
It works except when cordova is creating the gradle wrapper during prepEnv.

## Information
To get this to work I added an opts parameter to runGradleWrapper in ProjectBuilder.js. This passed in the arguments successfully and I was able to generate an APK using a Mac device with my project folder existing on a Windows file server using the --gradleArg=--project-cache-dir=/tmp.

### Command or Code
Added opts to ProjectBuilder.js:

/*
* This returns a promise
*/
runGradleWrapper (gradle_cmd, opts) {
var gradlePath = path.join(this.root, 'gradlew');
var wrapperGradle = path.join(this.root, 'wrapper.gradle');
if (fs.existsSync(gradlePath)) {
// Literally do nothing, for some reason this works, while !fs.existsSync didn't on Windows
} else if (opts.extraArgs) {
return execa(gradle_cmd, ['-p', this.root, 'wrapper', '-b', wrapperGradle, opts.extraArgs], { stdio: 'inherit' });
}
else {
return execa(gradle_cmd, ['-p', this.root, 'wrapper', '-b', wrapperGradle], { stdio: 'inherit' });
}
}

prepEnv (opts) {
var self = this;
return check_reqs.check_gradle()
.then(function (gradlePath) {
return self.runGradleWrapper(gradlePath, opts);
}).then(function () {
return self.prepBuildFiles();
}).then(() => {

### Environment, Platform, Device
Mac OS with project on Windows file server (SMB).

### Version information

## Checklist

- [x] I searched for existing GitHub issues
- [x] I updated all Cordova tooling to most recent version
- [x] I included all the necessary information above

Start in ProjectBuilder.js, focusing on runGradleWrapper and how prepEnv passes options while creating the Gradle wrapper. Reproduce the Cordova build with gradleArg=--project-cache-dir=/tmp on the described setup, then verify that the extra argument reaches the wrapper-generation command and the APK build succeeds.

Written by the indexing model from the issue text.