fix U796 - minor wording 'bug'

"You push the boulder into the pool" should be "Your steed pushes
the boulder into the pool" if done while riding since that's how other
boulder pushing messages are handled.

doc/fixes34.4

@@ -7,6 +7,7 @@ silver arrows weren't causing silver damage on some silver-haters when wielded
 wizard mode: avoid division by 0 crash for level teleport in the endgame if
 	confusion overrides teleport control
 don't #sit on an object in a pit if you're only on the precipice
+fix message when pushing a boulder into a pool while riding
 
 
 Platform- and/or Interface-Specific Fixes

src/do.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)do.c	3.4	2003/12/02	*/
+/*	SCCS Id: @(#)do.c	3.4	2003/12/17	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -74,7 +74,14 @@ boolean pushing;
 		
 		newsym(rx,ry);
 		if (pushing) {
-		    You("push %s into the %s.", the(xname(otmp)), what);
+		    char whobuf[BUFSZ];
+
+		    Strcpy(whobuf, "you");
+#ifdef STEED
+		    if (u.usteed) Strcpy(whobuf, y_monnam(u.usteed));
+#endif
+		    pline("%s %s %s into the %s.", upstart(whobuf),
+		          vtense(whobuf, "push"), the(xname(otmp)), what);
 		    if (flags.verbose && !Blind)
 			pline("Now you can cross it!");
 		    /* no splashing in this case */