v4: rename do_command() to do_command4()

Signed-off-by: Maciej Zenczykowski <maze@google.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/include/iptables.h b/include/iptables.h
index 204c92e..65b3290 100644
--- a/include/iptables.h
+++ b/include/iptables.h
@@ -7,7 +7,7 @@
 #include <iptables/internal.h>
 
 /* Your shared library should call one of these. */
-extern int do_command(int argc, char *argv[], char **table,
+extern int do_command4(int argc, char *argv[], char **table,
 		      struct iptc_handle **handle);
 extern int delete_chain4(const ipt_chainlabel chain, int verbose,
 			struct iptc_handle *handle);