remove redefinition 'mode_t'

components/libc/compilers/minilibc/sys/types.h

@@ -25,8 +25,6 @@ typedef unsigned short u_short;
 typedef unsigned int   u_int;
 typedef unsigned long  u_long;
 
-typedef int mode_t;
-
 typedef unsigned long clockid_t;
 typedef int pid_t;