ntdll: Remove duplicate includes.

dlls/ntdll/heap.c

@@ -35,7 +35,6 @@
 #include "ntstatus.h"
 #define WIN32_NO_STATUS
 #include "windef.h"
-#include "winternl.h"
 #include "winnt.h"
 #include "winternl.h"
 #include "wine/list.h"

dlls/ntdll/serial.c

@@ -39,9 +39,6 @@
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif
-#ifdef HAVE_TERMIOS_H
-#include <termios.h>
-#endif
 #include <fcntl.h>
 #ifdef HAVE_SYS_STAT_H
 # include <sys/stat.h>

dlls/ntdll/signal_powerpc.c

@@ -103,7 +103,6 @@ typedef struct ucontext SIGCONTEXT;
 # include <sys/ucontext.h>
 
 # include <sys/types.h>
-# include <signal.h>
 typedef siginfo_t siginfo;
 
 typedef struct ucontext SIGCONTEXT;