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/ex_docmd.c b/src/ex_docmd.c
index 9797644..8a9b2f4 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -562,7 +562,7 @@
     ++hold_gui_events;
 #endif
 
-    MSG(_("Entering Ex mode.  Type \"visual\" to go to Normal mode."));
+    msg(_("Entering Ex mode.  Type \"visual\" to go to Normal mode."));
     while (exmode_active)
     {
 	/* Check for a ":normal" command and no more characters left. */
@@ -1019,7 +1019,7 @@
 	    smsg(_("line %ld: %s"),
 					   (long)sourcing_lnum, cmdline_copy);
 	    if (msg_silent == 0)
-		msg_puts((char_u *)"\n");   /* don't overwrite this */
+		msg_puts("\n");   /* don't overwrite this */
 
 	    verbose_leave_scroll();
 	    --no_wait_return;
@@ -6043,7 +6043,7 @@
 
 	    /* Put out the title first time */
 	    if (!found)
-		MSG_PUTS_TITLE(_("\n    Name        Args       Address   Complete  Definition"));
+		msg_puts_title(_("\n    Name        Args       Address   Complete  Definition"));
 	    found = TRUE;
 	    msg_putchar('\n');
 	    if (got_int)
@@ -6150,7 +6150,7 @@
     }
 
     if (!found)
-	MSG(_("No user-defined commands found"));
+	msg(_("No user-defined commands found"));
 }
 
     static char *
@@ -7239,13 +7239,13 @@
 	}
 	if (p != NULL)
 	{
-	    MSG(p);
+	    msg((char *)p);
 	    vim_free(p);
 	}
 	else
-	    MSG("default");
+	    msg("default");
 #else
-	MSG(_("unknown"));
+	msg(_("unknown"));
 #endif
     }
     else if (load_colors(eap->arg) == FAIL)
@@ -7256,7 +7256,7 @@
 ex_highlight(exarg_T *eap)
 {
     if (*eap->arg == NUL && eap->cmd[2] == '!')
-	MSG(_("Greetings, Vim user!"));
+	msg(_("Greetings, Vim user!"));
     do_highlight(eap->arg, eap->forceit, FALSE);
 }
 
@@ -7672,7 +7672,7 @@
     else
 # endif
 	if (first_tabpage->tp_next == NULL)
-	    MSG(_("Already only one tab page"));
+	    msg(_("Already only one tab page"));
 	else
 	{
 	    tab_number = get_tabpage_arg(eap);
@@ -8921,9 +8921,9 @@
 ex_swapname(exarg_T *eap UNUSED)
 {
     if (curbuf->b_ml.ml_mfp == NULL || curbuf->b_ml.ml_mfp->mf_fname == NULL)
-	MSG(_("No swap file"));
+	msg(_("No swap file"));
     else
-	msg(curbuf->b_ml.ml_mfp->mf_fname);
+	msg((char *)curbuf->b_ml.ml_mfp->mf_fname);
 }
 
 /*
@@ -9221,7 +9221,7 @@
 #ifdef BACKSLASH_IN_FILENAME
 	slash_adjust(NameBuff);
 #endif
-	msg(NameBuff);
+	msg((char *)NameBuff);
     }
     else
 	emsg(_("E187: Unknown"));
@@ -9402,7 +9402,7 @@
 #  endif
 	{
 	    sprintf((char *)IObuff, _("Window position: X %d, Y %d"), x, y);
-	    msg(IObuff);
+	    msg((char *)IObuff);
 	}
 	else
 # endif