Hide APM Mock Links if APM is not built.

Fix Mocklink UI

src/ui/preferences/MockLink.qml

@@ -8,7 +8,9 @@
  ****************************************************************************/
 
 
-import QtQuick 2.3
+import QtQuick          2.11
+import QtQuick.Controls 2.4
+import QtQuick.Layouts  1.11
 
 import QGroundControl               1.0
 import QGroundControl.Controls      1.0
@@ -29,43 +31,54 @@ Rectangle {
         contentHeight:  column.height + (_margins * 2)
         clip:           true
 
-        Column {
+        ColumnLayout {
             id:                 column
             anchors.margins:    _margins
             anchors.left:       parent.left
             anchors.top:        parent.top
             spacing:            ScreenTools.defaultFontPixelHeight
 
+            QGCCheckBox {
+                id:             sendStatusText
+                text:           qsTr("Send status text + voice")
+            }
             QGCButton {
                 text:               qsTr("PX4 Vehicle")
+                Layout.fillWidth:   true
                 onClicked:          QGroundControl.startPX4MockLink(sendStatusText.checked)
             }
             QGCButton {
                 text:               qsTr("APM ArduCopter Vehicle")
+                visible:            QGroundControl.hasAPMSupport
+                Layout.fillWidth:   true
                 onClicked:          QGroundControl.startAPMArduCopterMockLink(sendStatusText.checked)
             }
             QGCButton {
                 text:               qsTr("APM ArduPlane Vehicle")
+                visible:            QGroundControl.hasAPMSupport
+                Layout.fillWidth:   true
                 onClicked:          QGroundControl.startAPMArduPlaneMockLink(sendStatusText.checked)
             }
             QGCButton {
                 text:               qsTr("APM ArduSub Vehicle")
+                visible:            QGroundControl.hasAPMSupport
+                Layout.fillWidth:   true
                 onClicked:          QGroundControl.startAPMArduSubMockLink(sendStatusText.checked)
             }
             QGCButton {
                 text:               qsTr("APM ArduRover Vehicle")
+                visible:            QGroundControl.hasAPMSupport
+                Layout.fillWidth:   true
                 onClicked:          QGroundControl.startAPMArduRoverMockLink(sendStatusText.checked)
             }
             QGCButton {
                 text:               qsTr("Generic Vehicle")
+                Layout.fillWidth:   true
                 onClicked:          QGroundControl.startGenericMockLink(sendStatusText.checked)
             }
-            QGCCheckBox {
-                id:     sendStatusText
-                text:   qsTr("Send status text + voice")
-            }
             QGCButton {
                 text:               qsTr("Stop One MockLink")
+                Layout.fillWidth:   true
                 onClicked:          QGroundControl.stopOneMockLink()
             }
         }