receive-pack hooks updates.

The earlier one conflated update and post-update hooks for no
good reason.  Correct that ugly hack.  Now post-update hooks
will take the list of successfully updated refs.

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/run-command.h b/run-command.h
index 4f64613..5ee0972 100644
--- a/run-command.h
+++ b/run-command.h
@@ -11,6 +11,7 @@
 	ERR_RUN_COMMAND_WAITPID_NOEXIT,
 };
 
+int run_command_v(int argc, char **argv);
 int run_command(const char *cmd, ...);
 
 #endif