add lcdvc client: virtal console on LCD

clients/lcdvc/vc_link.h

@@ -0,0 +1,11 @@
+#ifndef VC_LINK_H
+#define VC_LINK_H
+
+extern unsigned short vc_width, vc_height;
+extern unsigned short vc_cursor_x, vc_cursor_y;
+extern char * vc_buf;
+
+int open_vcs();
+int read_vcdata();
+
+#endif