Added missing JUCE_API keywords

modules/juce_audio_utils/gui/juce_AudioAppComponent.h

@@ -34,8 +34,8 @@
     getNextAudioBlock(). The base class provides a basic AudioDeviceManager object
     and runs audio through the default output device.
 */
-class AudioAppComponent   : public Component,
-                            public AudioSource
+class JUCE_API AudioAppComponent   : public Component,
+                                     public AudioSource
 {
 public:
     AudioAppComponent();

modules/juce_audio_utils/gui/juce_AudioVisualiserComponent.h

@@ -40,8 +40,8 @@
     real-world app that requires more powerful waveform display, you'll probably want to
     create your own component instead.
 */
-class AudioVisualiserComponent  : public Component,
-                                  private Timer
+class JUCE_API AudioVisualiserComponent  : public Component,
+                                           private Timer
 {
 public:
     /** Creates a visualiser with the given number of channels. */

modules/juce_audio_utils/gui/juce_BluetoothMidiDevicePairingDialogue.h

@@ -42,7 +42,7 @@
     supported.
 */
 
-class BluetoothMidiDevicePairingDialogue
+class JUCE_API BluetoothMidiDevicePairingDialogue
 {
 public: