Make debugInfo optional in Executable class.

src/jvmMain/kotlin/mtmc/os/exec/Executable.kt

@@ -16,7 +16,7 @@ data class Executable(
   @JvmField val data: ByteArray,
   @JvmField val graphics: Array<ByteArray>,
   val sourceName: String,
-  @JvmField val debugInfo: DebugInfo
+  @JvmField val debugInfo: DebugInfo?
 ) {
   enum class Format(val formatName: String) {
     Orc1("orc1");