增加rtconfig.h头文件

include/libc/libc_limits.h

@@ -12,6 +12,7 @@
 #define LIBC_LIMITS_H__
 
 #include <limits.h>
+#include <rtconfig.h>
 
 #ifdef RT_USING_POSIX
 

include/libc/libc_stdio.h

@@ -11,6 +11,8 @@
 #ifndef LIBC_STDIO_H__
 #define LIBC_STDIO_H__
 
+#include <rtconfig.h>
+
 #ifdef RT_USING_POSIX_GETLINE
 
 #include <posix_getline.h>