Tools/MapExtractor: Add some missing includes, needed for OSX

Closes #10454

src/tools/map_extractor/System.cpp

@@ -4,6 +4,7 @@
 #include <deque>
 #include <list>
 #include <cstdlib>
+#include <cstring>
 
 #ifdef _WIN32
 #include "direct.h"

src/tools/map_extractor/adt.cpp

@@ -1,6 +1,7 @@
 #define _CRT_SECURE_NO_DEPRECATE
 
 #include "adt.h"
+#include <cstring>
 
 // Helper
 int holetab_h[4] = {0x1111, 0x2222, 0x4444, 0x8888};