Include <iterator> instead of <array> for std::size

As `std::size` nominally resides in `<iterator>`.

src/base/system.cpp

@@ -1,6 +1,5 @@
 /* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
 /* If you are missing that file, acquire a complete release at teeworlds.com.                */
-#include <array> // std::size
 #include <atomic>
 #include <cctype>
 #include <cmath>
@@ -9,6 +8,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <ctime>
+#include <iterator> // std::size
 #include <thread>
 
 #include "system.h"

src/engine/shared/compression.cpp

@@ -4,7 +4,7 @@
 
 #include "compression.h"
 
-#include <array> // std::size
+#include <iterator> // std::size
 
 // Format: ESDDDDDD EDDDDDDD EDD... Extended, Data, Sign
 unsigned char *CVariableInt::Pack(unsigned char *pDst, int i, int DstSize)

src/engine/shared/console.cpp

@@ -14,7 +14,7 @@
 #include "console.h"
 #include "linereader.h"
 
-#include <array> // std::size
+#include <iterator> // std::size
 #include <new>
 
 // todo: rework this

src/tools/crapnet.cpp

@@ -3,8 +3,8 @@
 #include <base/logger.h>
 #include <base/system.h>
 
-#include <array> // std::size
 #include <cstdlib>
+#include <iterator> // std::size
 
 #include <thread>