title: struggling to compile go project with gogradle
body: <p>I had this working in another vm. I have the same versions of the tooling being used:</p>
  
  <ul>
  <li>Gradle 4.9</li>
  <li>Java 8 Update 181</li>
  <li>golang 1.9.7</li>
  <li>gogradle pluging 0.10</li>
  </ul>
  
  <p>I receive the following error:</p>
  
  <p>13:44 $ gradle build</p>
  
  <pre><code>&gt; Configure project :
  Found go 1.9.7 in /home/phil/dev/tools/go/current/bin/go, use it.
  
  &gt; Task :prepare
  Use project GOPATH: /home/phil/dev/projects/misc/go/Notification_System_GO/.gogradle/project_gopath
  .gogradle/project_gopath/src/com.misc/notifications/vendor/cloud.google.com/go/pubsub/subscription.go:30:2: cannot find package "golang.org/x/sync/errgroup" in any of:
          /home/phil/dev/projects/misc/go/Notification_System_GO/.gogradle/project_gopath/src/com.misc/notifications/vendor/golang.org/x/sync/errgroup (vendor tree)
          /home/phil/dev/tools/go/go1.9.7/src/golang.org/x/sync/errgroup (from $GOROOT)
          /home/phil/dev/projects/misc/go/Notification_System_GO/.gogradle/project_gopath/src/golang.org/x/sync/errgroup (from $GOPATH)
  .gogradle/project_gopath/src/com.misc/notifications/vendor/cloud.google.com/go/pubsub/flow_controller.go:19:2: cannot find package "golang.org/x/sync/semaphore" in any of:
          /home/phil/dev/projects/misc/go/Notification_System_GO/.gogradle/project_gopath/src/com.misc/notifications/vendor/golang.org/x/sync/semaphore (vendor tree)
          /home/phil/dev/tools/go/go1.9.7/src/golang.org/x/sync/semaphore (from $GOROOT)
          /home/phil/dev/projects/misc/go/Notification_System_GO/.gogradle/project_gopath/src/golang.org/x/sync/semaphore (from $GOPATH)
  .gogradle/project_gopath/src/com.misc/notifications/vendor/google.golang.org/api/transport/grpc/dial.go:29:2: cannot find package "google.golang.org/grpc/credentials/oauth" in any of:
          /home/phil/dev/projects/misc/go/Notification_System_GO/.gogradle/project_gopath/src/com.misc/notifications/vendor/google.golang.org/grpc/credentials/oauth (vendor tree)
          /home/phil/dev/tools/go/go1.9.7/src/google.golang.org/grpc/credentials/oauth (from $GOROOT)
          /home/phil/dev/projects/misc/go/Notification_System_GO/.gogradle/project_gopath/src/google.golang.org/grpc/credentials/oauth (from $GOPATH)
  </code></pre>
  
  <p>the build.gradle is as follows:</p>
  
  <pre><code>plugins {
      id 'com.github.blindpirate.gogradle' version '0.10'
  }
  
  golang {
      packagePath = 'com.misc/notifications'
  }
  
  dependencies {
      golang {
          build name: 'google.golang.org/appengine', tag: 'v1.1.0'
          build name: 'github.com/golang/protobuf'
          build name: 'github.com/golang/mock'
          build name: 'cloud.google.com/go', tag: 'v0.22.0'
          build name: 'github.com/googleapis/gax-go', tag: '1.0.0'
      }
  }
  
  build {
      outputLocation = './bin/notifications'
  }
  </code></pre>
  
  <p>Any assistance would be greatly appreciated</p>