patch 8.1.0779: argument for message functions is inconsistent

Problem:    Argument for message functions is inconsistent.
Solution:   Make first argument to msg() "char *".
diff --git a/src/ui.c b/src/ui.c
index 08dc9d0..5451570 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -340,7 +340,7 @@
 	emsg(_(e_shellempty));
     else
     {
-	MSG_PUTS(_("new shell started\n"));
+	msg_puts(_("new shell started\n"));
 	do_shell(NULL, 0);
     }
 }
@@ -2626,7 +2626,7 @@
 	if (p_verbose > 0)
 	{
 	    verbose_enter();
-	    verb_msg((char_u *)_("Used CUT_BUFFER0 instead of empty selection"));
+	    verb_msg(_("Used CUT_BUFFER0 instead of empty selection"));
 	    verbose_leave();
 	}
     }