[rtlibc] remove libc_stdio.h

Author: mysterywolf

include/libc/libc_stdio.h

@@ -18,7 +18,6 @@
 #include "libc/libc_dirent.h"
 #include "libc/libc_signal.h"
 #include "libc/libc_fdset.h"
-#include "libc/libc_stdio.h"
 
 #ifndef RT_USING_LIBC
 #if defined(__CC_ARM) || defined(__CLANG_ARM) || defined(__IAR_SYSTEMS_ICC__)