[libc] Remove unnecessary stdio.h includes (#98132)

Author: petrhosek

libc/src/stdio/baremetal/getchar.cpp

@@ -9,8 +9,6 @@
 #include "src/stdio/getchar.h"
 #include "src/__support/OSUtil/io.h"
 
-#include <stdio.h>
-
 namespace LIBC_NAMESPACE {
 
 LLVM_LIBC_FUNCTION(int, getchar, ()) {

libc/src/stdio/puts.h

@@ -9,8 +9,6 @@
 #ifndef LLVM_LIBC_SRC_STDIO_PUTS_H
 #define LLVM_LIBC_SRC_STDIO_PUTS_H
 
-#include <stdio.h>
-
 namespace LIBC_NAMESPACE {
 
 int puts(const char *__restrict str);