PluginHostType: Fix host reporting in bridged hosts on M1

Reports the correct host name for Apple hosts on M1 which host plugins
in a separate process.

Affected hosts are:
- Logic Pro
- GarageBand
- MainStage
- Final Cut Pro

modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm

@@ -675,6 +675,19 @@ public:
                     return noErr;
                 }
 
+               #if defined (MAC_OS_X_VERSION_10_12)
+                case kAudioUnitProperty_AUHostIdentifier:
+                {
+                    if (inDataSize < sizeof (AUHostVersionIdentifier))
+                        return kAudioUnitErr_InvalidPropertyValue;
+
+                    const auto* identifier = static_cast<const AUHostVersionIdentifier*> (inData);
+                    PluginHostType::getHostIdReportedByWrapper() = String::fromCFString (identifier->hostName);
+
+                    return noErr;
+                }
+               #endif
+
                 default: break;
             }
         }

modules/juce_audio_plugin_client/utility/juce_PluginHostType.h

@@ -297,11 +297,16 @@ public:
 
     //==============================================================================
 
-   #ifndef DOXYGEN
+  #ifndef DOXYGEN
     // @internal
     static AudioProcessor::WrapperType jucePlugInClientCurrentWrapperType;
     static std::function<bool (AudioProcessor&)> jucePlugInIsRunningInAudioSuiteFn;
-   #endif
+    static String& getHostIdReportedByWrapper()
+    {
+        static String hostId;
+        return hostId;
+    }
+  #endif
 
 private:
     static HostType getHostType()
@@ -357,6 +362,11 @@ private:
         if (hostFilename.containsIgnoreCase   ("AudioPluginHost"))          return JUCEPluginHost;
         if (hostFilename.containsIgnoreCase   ("Vienna Ensemble Pro"))      return ViennaEnsemblePro;
 
+       #if defined (JucePlugin_Build_AU)
+        if (getHostIdReportedByWrapper() == "com.apple.logic.pro")          return AppleLogic;
+        if (getHostIdReportedByWrapper() == "com.apple.garageband")         return AppleGarageBand;
+       #endif
+
        #elif JUCE_WINDOWS
         if (hostFilename.containsIgnoreCase   ("Live 6"))                return AbletonLive6;
         if (hostFilename.containsIgnoreCase   ("Live 7"))                return AbletonLive7;