Add include to zlib.h as it uses the structures defined in the zlib.h

Up until now, the minizip was including this header file, but minizip-ng
does not and it causing the build to fail.
If the file uses structures defined in the zlib.h it should explicitly
include it.

src/util/ZipSerialize.cpp

@@ -22,6 +22,7 @@
 #include "DateTime.h"
 #include "log.h"
 
+#include <zlib.h>
 #include <minizip/unzip.h>
 #include <minizip/zip.h>
 #ifdef _WIN32