Use printf rather than echo -n.

On AIX, there is no -n option to the system's echo.  Instead,
it needs the '\c' control character.  We could replace
  echo -n "foo"
with
  echo -e "foo\c"
but printf is recommended by most man pages.  Tested on AIX
5.3, Solaris 8, and Debian.

[jc: futureproofed two instances that uses variable with '%s'
 so later feeding different messages would not break things too
 easily; others are emitting literal so whoever changes the
 literal ought to notice more easily so they are safe.]

Signed-off-by: E. Jason Riedy <ejr@cs.berkeley.edu>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-bisect.sh

@@ -67,7 +67,7 @@ bisect_start() {
 	rm -rf "$GIT_DIR/refs/bisect/"
 	mkdir "$GIT_DIR/refs/bisect"
 	{
-	    echo -n "git-bisect start"
+	    printf "git-bisect start"
 	    sq "$@"
 	} >"$GIT_DIR/BISECT_LOG"
 	sq "$@" >"$GIT_DIR/BISECT_NAMES"