get rid of MAX_PATH_CHARACTERS in factory.c

src/factory.h

@@ -1,5 +1,8 @@
 /* vim:expandtab:ts=2 sw=2:
 */
+#ifndef FACTORY_H__
+#define FACTORY_H__
+
 void Button_Brush_Factory(int);
 void Repeat_script(void);
 
@@ -16,3 +19,5 @@ void Run_numbered_script(byte index);
 /// Returns a string stating the included Lua engine version,
 /// or "Disabled" if Grafx2 is compiled without Lua.
 const char * Lua_version(void);
+
+#endif