Merge pull request #3491 from GitHubIDforRoger/posix_termios.h头文件找不到pid_t定义的bug

posix_termios.h头文件修改

components/libc/termios/posix_termios.h

@@ -11,6 +11,7 @@
 #define TERMIOS_H__
 
 #include <rtthread.h>
+#include <termios.h>
 
 #ifdef __cplusplus
 extern "C" {