add RT_DFS_ELM_CODE_PAGE 
add RT_DFS_ELM_CODE_PAGE 

解决因为缺少RT_DFS_ELM_CODE_PAGE 导致scons无法正确配置工程文件系统代码页问题。
igou/rt-thread,gbcwbz/rt-thread,zhaojuntao/rt-thread,hezlog/rt-thread,armink/rt-thread,geniusgogo/rt-thread,nongxiaoming/rt-thread,weiyuliang/rt-thread,yongli3/rt-thread,yongli3/rt-thread,RT-Thread/rt-thread,igou/rt-thread,AubrCool/rt-thread,weiyuliang/rt-thread,yongli3/rt-thread,weiyuliang/rt-thread,nongxiaoming/rt-thread,hezlog/rt-thread,zhaojuntao/rt-thread,armink/rt-thread,geniusgogo/rt-thread,wolfgangz2013/rt-thread,yongli3/rt-thread,yongli3/rt-thread,RT-Thread/rt-thread,AubrCool/rt-thread,FlyLu/rt-thread,nongxiaoming/rt-thread,weety/rt-thread,weety/rt-thread,RT-Thread/rt-thread,gbcwbz/rt-thread,zhaojuntao/rt-thread,nongxiaoming/rt-thread,FlyLu/rt-thread,hezlog/rt-thread,ArdaFu/rt-thread,RT-Thread/rt-thread,armink/rt-thread,weety/rt-thread,zhaojuntao/rt-thread,hezlog/rt-thread,geniusgogo/rt-thread,zhaojuntao/rt-thread,gbcwbz/rt-thread,weety/rt-thread,gbcwbz/rt-thread,igou/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,wolfgangz2013/rt-thread,yongli3/rt-thread,weety/rt-thread,geniusgogo/rt-thread,weiyuliang/rt-thread,AubrCool/rt-thread,zhaojuntao/rt-thread,FlyLu/rt-thread,gbcwbz/rt-thread,wolfgangz2013/rt-thread,wolfgangz2013/rt-thread,geniusgogo/rt-thread,hezlog/rt-thread,weety/rt-thread,yongli3/rt-thread,nongxiaoming/rt-thread,armink/rt-thread,wolfgangz2013/rt-thread,wolfgangz2013/rt-thread,FlyLu/rt-thread,weiyuliang/rt-thread,AubrCool/rt-thread,wolfgangz2013/rt-thread,RT-Thread/rt-thread,hezlog/rt-thread,nongxiaoming/rt-thread,weety/rt-thread,FlyLu/rt-thread,igou/rt-thread,ArdaFu/rt-thread,gbcwbz/rt-thread,ArdaFu/rt-thread,AubrCool/rt-thread,zhaojuntao/rt-thread,igou/rt-thread,armink/rt-thread,AubrCool/rt-thread,armink/rt-thread,hezlog/rt-thread,geniusgogo/rt-thread,FlyLu/rt-thread,ArdaFu/rt-thread,geniusgogo/rt-thread,armink/rt-thread,weiyuliang/rt-thread,ArdaFu/rt-thread,AubrCool/rt-thread,igou/rt-thread,ArdaFu/rt-thread,nongxiaoming/rt-thread,igou/rt-thread,FlyLu/rt-thread,weiyuliang/rt-thread,ArdaFu/rt-thread,gbcwbz/rt-thread