Add ARAExtension

Author: FangCunWuChang

.gitmodules

@@ -22,3 +22,6 @@
 [submodule "JUCE"]
 	path = JUCE
 	url = https://github.com/Do-sth-sharp/JUCE-Fixed.git
+[submodule "ARAExtension"]
+	path = ARAExtension
+	url = https://github.com/Do-sth-sharp/ARAExtension.git

ARAExtension

@@ -33,6 +33,7 @@ set (VST2_SDK_PATH "${CMAKE_CURRENT_SOURCE_DIR}/vst2-sdk-for-vst3sdk")
 set (VST3_SDK_PATH "${CMAKE_CURRENT_SOURCE_DIR}/vst3sdk")
 set (ASIO_SDK_PATH "${CMAKE_CURRENT_SOURCE_DIR}/asiosdk_2.3.3_2019-06-14")
 set (ARA_SDK_PATH "${CMAKE_CURRENT_SOURCE_DIR}/ARA_SDK")
+set (ARA_EXTENSION_PATH "${CMAKE_CURRENT_SOURCE_DIR}/ARAExtension")
 
 # ============================
 # Options
@@ -201,7 +202,7 @@ if (JUCE_PLUGINHOST_LV2)
 endif (JUCE_PLUGINHOST_LV2)
 if (JUCE_PLUGINHOST_ARA)
 	if (DEFINED ARA_SDK_PATH)
-		set (JUCE_ARA_INC_PATH ${ARA_SDK_PATH})
+		set (JUCE_ARA_INC_PATH ${ARA_SDK_PATH} ${ARA_EXTENSION_PATH})
 	else (DEFINED ARA_SDK_PATH)
 		message (SEND_ERROR "ARA SDK notfound!")
 	endif (DEFINED ARA_SDK_PATH)