Remove unused header files

Author: simonzgx

libc/src/stdio/linux/fdopen.cpp

@@ -15,8 +15,6 @@
 #include "src/fcntl/fcntl.h"
 #include "src/stdio/fseek.h"
 
-#include <stdio.h>
-
 namespace LIBC_NAMESPACE {
 
 LLVM_LIBC_FUNCTION(::FILE *, fdopen, (int fd, const char *mode)) {

libc/test/src/stdio/fdopen_test.cpp

@@ -16,7 +16,6 @@
 #include "src/stdio/fputs.h"
 #include "src/unistd/close.h"
 #include "test/UnitTest/ErrnoSetterMatcher.h"
-#include "test/UnitTest/LibcTest.h"
 #include "test/UnitTest/Test.h"
 
 #include <sys/stat.h> // For S_IRWXU