Fix bug when compiling minizip with C++ [Vollant].
diff --git a/contrib/minizip/mztools.h b/contrib/minizip/mztools.h
index 88b3459..a49a426 100644
--- a/contrib/minizip/mztools.h
+++ b/contrib/minizip/mztools.h
@@ -28,4 +28,10 @@
                              uLong* nRecovered,
                              uLong* bytesRecovered);
 
+
+#ifdef __cplusplus
+}
+#endif
+
+
 #endif