makeman: replace -\|/ twiddles with dots

It shows progress more clearly, there aren't so many that the output
is excessive, and it's more friendly for things like Cirrus-CI's
logging that print the backspaces as boxes.

Reviewed by:	emaste
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D38990

tools/build/options/makeman

@@ -317,8 +317,9 @@ EOF
 				;;
 		esac
 
-		twiddle >&2
+		printf "." >&2
 	done
+	printf "\n" >&2
 	cat <<EOF
 .El
 .Sh FILES
@@ -343,13 +344,4 @@ This manual page was autogenerated by
 EOF
 }
 
-twiddle_pos=0
-twiddle()
-{
-	local c0='|' c1='/' c2='-' c3='\'
-
-	eval printf '%c\\b' '$c'${twiddle_pos}
-	twiddle_pos=$(((twiddle_pos+1)%4))
-}
-
 main