Fix Windows build, clean up included headers

Also fix a startup error caused by s_security.cpp

src/objdef.cpp

@@ -17,11 +17,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#include <strings.h>
 #include "objdef.h"
 #include "util/numeric.h"
-#include "debug.h"
-#include "porting.h"
 #include "log.h"
 #include "gamedef.h"
 

src/objdef.h

@@ -20,9 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #ifndef OBJDEF_HEADER
 #define OBJDEF_HEADER
 
-#include <string>
-#include <vector>
-#include "irrlichttypes.h"
+#include "porting.h"
 
 class IGameDef;
 class INodeDefManager;

src/script/cpp_api/s_security.cpp

@@ -264,7 +264,7 @@ bool ScriptApiSecurity::safeLoadFile(lua_State *L, const char *path)
 		fp = stdin;
 		chunk_name = const_cast<char *>("=stdin");
 	} else {
-		fp = fopen(path, "r");
+		fp = fopen(path, "rb");
 		if (!fp) {
 			lua_pushfstring(L, "%s: %s", path, strerror(errno));
 			return false;