Codechange: Remove duplicated includes. (#10888)

These are now included by stdafx.h so don't need to be included again.

src/os/macosx/crashlog_osx.cpp

@@ -15,7 +15,6 @@
 #include "../../video/video_driver.hpp"
 #include "macos.h"
 
-#include <errno.h>
 #include <signal.h>
 #include <mach-o/arch.h>
 #include <dlfcn.h>

src/os/os2/os2.cpp

@@ -21,7 +21,6 @@
 #include <dirent.h>
 #include <unistd.h>
 #include <sys/stat.h>
-#include <stdlib.h>
 #include <time.h>
 #ifndef __INNOTEK_LIBC__
 #	include <dos.h>

src/os/os2/os2_main.cpp

@@ -12,7 +12,6 @@
 #include "../../core/random_func.hpp"
 #include "../../string_func.h"
 
-#include <stdlib.h>
 #include <time.h>
 
 #include "../../safeguards.h"

src/os/unix/crashlog_unix.cpp

@@ -13,7 +13,6 @@
 #include "../../gamelog.h"
 #include "../../saveload/saveload.h"
 
-#include <errno.h>
 #include <signal.h>
 #include <sys/utsname.h>
 

src/os/unix/unix.cpp

@@ -108,7 +108,6 @@ bool FiosIsHiddenFile(const struct dirent *ent)
 #ifdef WITH_ICONV
 
 #include <iconv.h>
-#include <errno.h>
 #include "../../debug.h"
 #include "../../string_func.h"
 

src/os/windows/win32.cpp

@@ -23,7 +23,6 @@
 #include "../../fios.h"
 #include "../../core/alloc_func.hpp"
 #include "../../string_func.h"
-#include <errno.h>
 #include <sys/stat.h>
 #include "../../language.h"
 #include "../../thread.h"