Fix build with minizip 4

Index: src/io/filesystem/zip_filesystem.h
--- src/io/filesystem/zip_filesystem.h.orig
+++ src/io/filesystem/zip_filesystem.h
@@ -23,6 +23,7 @@
 
 #include <unzip.h>
 #include <zip.h>
+#include <zlib.h>
 
 #include "io/filesystem/filesystem.h"
 #include "io/streamread.h"
