feat!: both native & Go synths are included in the same executables

Closes #200

cmd/synthers_native.go

@@ -0,0 +1,9 @@
+//go:build native
+
+package cmd
+
+import "github.com/vsariola/sointu/vm/compiler/bridge"
+
+func init() {
+	Synthers = append(Synthers, bridge.NativeSynther{})
+}