Initial experiment in adding js support to w3m.

fm.h

@@ -519,8 +519,19 @@ typedef struct _Buffer {
 #ifdef USE_ALARM
     struct _AlarmEvent *event;
 #endif
+#ifdef USE_JAVASCRIPT
+    struct BufferJSState *js_state;
+    struct W3MDocument *js_document;
+    struct W3MEventSystem *js_events;
+#endif
 } Buffer;
 
+#ifdef USE_JAVASCRIPT
+#include "js/w3m_javascript.h"
+#include "js/w3m_dom.h"
+#include "js/w3m_events.h"
+#endif
+
 typedef struct _BufferPos {
     long top_linenumber;
     long cur_linenumber;