Fix macOS compilation of plugins with '-' in their name

Makefile.plugins.mk

@@ -194,6 +194,8 @@ clean:
 
 # ---------------------------------------------------------------------------------------------------------------------
 
+AS_PUGL_NAMESPACE = $(subst -,_,$(1))
+
 $(BUILD_DIR)/DistrhoPluginMain_%.cpp.o: $(DPF_PATH)/distrho/DistrhoPluginMain.cpp
 	-@mkdir -p $(BUILD_DIR)
 	@echo "Compiling DistrhoPluginMain.cpp ($*)"
@@ -207,7 +209,7 @@ $(BUILD_DIR)/DistrhoUIMain_%.cpp.o: $(DPF_PATH)/distrho/DistrhoUIMain.cpp
 $(BUILD_DIR)/DistrhoUI_macOS_%.mm.o: $(DPF_PATH)/distrho/DistrhoUI_macOS.mm
 	-@mkdir -p $(BUILD_DIR)
 	@echo "Compiling DistrhoUI_macOS.mm ($*)"
-	$(SILENT)$(CXX) $< $(BUILD_CXX_FLAGS) -DPUGL_NAMESPACE=$* -DGL_SILENCE_DEPRECATION -Wno-deprecated-declarations -I$(DPF_PATH)/dgl/src -I$(DPF_PATH)/dgl/src/pugl-upstream/include -ObjC++ -c -o $@
+	$(SILENT)$(CXX) $< $(BUILD_CXX_FLAGS) -DPUGL_NAMESPACE=$(call AS_PUGL_NAMESPACE,$*) -DGL_SILENCE_DEPRECATION -Wno-deprecated-declarations -I$(DPF_PATH)/dgl/src -I$(DPF_PATH)/dgl/src/pugl-upstream/include -ObjC++ -c -o $@
 
 $(BUILD_DIR)/DistrhoPluginMain_JACK.cpp.o: $(DPF_PATH)/distrho/DistrhoPluginMain.cpp
 	-@mkdir -p $(BUILD_DIR)