Bug 40013: [android] Add option do overwrite timestamp in extension version

                rename { 'manifest.json' }

                into extDir

                def values = ['version': getManifestVersionString(rootProject.ext.config.componentsVersion)]

                def systemEnvBuildDate = System.getenv('MOZ_BUILD_DATE')

                // MOZ_BUILD_DATE is in the YYYYMMDDHHMMSS format. Thus, we only use a

                // substring of it if it is available.

                def values = ['version': rootProject.ext.config.componentsVersion + "." +

                        (systemEnvBuildDate != null ?

                                systemEnvBuildDate.substring(4) :

                                new Date().format('MMddHHmmss'))]

                inputs.properties(values)

                expand(values)

            }