stdio: remove depends on setbuf setvbuf

N/A

Cause the function realize will handle this

Change-Id: I154c21c7a40667afae423bb0ebb67de8f5fc42fd
Signed-off-by: ligd <liguiding1@xiaomi.com>

include/stdio.h

@@ -164,10 +164,8 @@ FAR char *gets(FAR char *s);
 FAR char *gets_s(FAR char *s, rsize_t n);
 void   rewind(FAR FILE *stream);
 
-#ifndef CONFIG_STDIO_DISABLE_BUFFERING
 void   setbuf(FAR FILE *stream, FAR char *buf);
 int    setvbuf(FAR FILE *stream, FAR char *buffer, int mode, size_t size);
-#endif
 
 int    ungetc(int c, FAR FILE *stream);