UnitTestsDemo: Enable LV2 hosting, so that the Projucer correctly sets up include paths

examples/Utilities/UnitTestsDemo.h

@@ -36,7 +36,7 @@
                    juce_opengl, juce_osc, juce_product_unlocking, juce_video
  exporters:        xcode_mac, vs2022, linux_make, androidstudio, xcode_iphone
 
- moduleFlags:      JUCE_STRICT_REFCOUNTEDPOINTER=1,JUCE_PLUGINHOST_VST3=1
+ moduleFlags:      JUCE_STRICT_REFCOUNTEDPOINTER=1,JUCE_PLUGINHOST_VST3=1,JUCE_PLUGINHOST_LV2=1
  defines:          JUCE_UNIT_TESTS=1
 
  type:             Component

modules/juce_audio_processors/juce_audio_processors.cpp

@@ -225,6 +225,11 @@ private:
 #include "format_types/juce_LV2PluginFormat.cpp"
 
 #if JUCE_UNIT_TESTS
- #include "format_types/juce_VST3PluginFormat_test.cpp"
- #include "format_types/juce_LV2PluginFormat_test.cpp"
+ #if JUCE_PLUGINHOST_VST3
+  #include "format_types/juce_VST3PluginFormat_test.cpp"
+ #endif
+
+ #if JUCE_PLUGINHOST_LV2
+  #include "format_types/juce_LV2PluginFormat_test.cpp"
+ #endif
 #endif