Try to fix new ddnet base structure

Author: ChillerDragon

src/twbl/teeworlds/base/system.h

@@ -3,7 +3,17 @@
 
 #include <cstdint>
 #if __has_include(<base/system.h>)
-#include <base/system.h>
+#elif __has_include(<base/str.h>)
+#include <base/str.h>
+#include <base/log.h>
+#include <base/dbg.h>
+#include <base/io.h>
+#include <base/fs.h>
+#include <base/mem.h>
+#include <base/net.h>
+#include <base/os.h>
+#include <base/math.h>
+#include <base/vmath.h>
 #else
 
 #include <cstdio>