Fix Rack macOS SDK separation.

Makefile

@@ -164,10 +164,10 @@ RACK_DIR_MAC_X64 := $(PWD)/$(rack-sdk-mac-x64)
 rack-sdk-mac-arm64 := Rack-SDK-mac-arm64
 rack-sdk-mac-arm64: $(rack-sdk-mac-arm64)
 $(rack-sdk-mac-arm64):
-	$(WGET) "https://vcvrack.com/downloads/Rack-SDK-$(RACK_SDK_VERSION)-arm64.zip"
-	$(UNZIP) Rack-SDK-$(RACK_SDK_VERSION)-arm64.zip
+	$(WGET) "https://vcvrack.com/downloads/Rack-SDK-$(RACK_SDK_VERSION)-mac-arm64.zip"
+	$(UNZIP) Rack-SDK-$(RACK_SDK_VERSION)-mac-arm64.zip
 	mv Rack-SDK Rack-SDK-mac-arm64
-	rm Rack-SDK-$(RACK_SDK_VERSION)-arm64.zip
+	rm Rack-SDK-$(RACK_SDK_VERSION)-mac-arm64.zip
 RACK_DIR_MAC_ARM64 := $(PWD)/$(rack-sdk-mac-arm64)