多个ulog后端时不支持support_color后端的log指针偏移错误，导致保存到文件的日志出现乱码。
多个ulog后端时不支持support_color后端的log指针偏移错误，导致保存到文件的日志出现乱码。

nongxiaoming/rt-thread,hezlog/rt-thread,RT-Thread/rt-thread,geniusgogo/rt-thread,hezlog/rt-thread,nongxiaoming/rt-thread,geniusgogo/rt-thread,nongxiaoming/rt-thread,nongxiaoming/rt-thread,RT-Thread/rt-thread,hezlog/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,nongxiaoming/rt-thread,nongxiaoming/rt-thread,geniusgogo/rt-thread,geniusgogo/rt-thread,geniusgogo/rt-thread,hezlog/rt-thread,RT-Thread/rt-thread,hezlog/rt-thread,geniusgogo/rt-thread,nongxiaoming/rt-thread,hezlog/rt-thread,hezlog/rt-thread,geniusgogo/rt-thread