继续把 interp_execute.cc、interp_queue.cc、interp_find.cc 等 LinuxCNC 源文件纳入直接编译/链接路径，逐步删除临时 convert_g() wrapper 行为

结论：已将核心 LinuxCNC interpreter 源接入 standalone native 编译链接路径，移除 minimal runtime 中的手写 convert_g 行为，并通过 native probe 验证。

wasm-port/vendor/linuxcnc/src/emc/linuxcnc.h

@@ -0,0 +1,27 @@
+/********************************************************************
+* Description: linuxcnc.h
+*	Common defines used in many emc2 source files.
+*
+*
+* Author: Petter Reinholdtsen
+* License: LGPL Version 2
+* System: Any
+*
+* Copyright (c) 2021 All rights reserved.
+********************************************************************/
+
+#ifndef __LINUXCNC_LINUXCNC_H
+#define __LINUXCNC_LINUXCNC_H
+
+/* LINELEN is used throughout for buffer sizes, length of file name strings,
+   etc. Let's just have one instead of a multitude of defines all the same. */
+#define LINELEN 255
+
+/* Used in a number of places for sprintf() buffers. */
+#define BUFFERLEN 80
+
+/* Imperial/Metric conversion */
+#define MM_PER_INCH 25.4
+#define INCH_PER_MM (1.0/MM_PER_INCH)
+
+#endif /* LINUXCNC_H */