Remove tac.sh

It has its own repository.

tac.sh

@@ -1,26 +0,0 @@
-#!/bin/sh
-usage() {
-	echo 'usage: tac [-b] [-s separator] [file ...]' >&2
-	exit 64
-}
-bflag=
-rs='\n'
-while getopts bs: opt; do
-	case "$opt" in
-	b)	bflag=1;;
-	s)	rs="$OPTARG";;
-	*)	usage;;
-	esac
-done
-shift $((OPTIND - 1))
-rs="$(printf %s "$rs" | sed 's/[][)(}{.+?*^$]/\\&/g')"
-awk -vRS="$rs" -vORS="$rs" -vb="$bflag" '{
-	a[NR] = $0
-} END {
-	if (b)
-		for (i = NR; i > 0; i--)
-			printf "%s%s", ORS, a[i]
-	else
-		for (i = NR; i > 0; i--)
-			printf "%s%s", a[i], ORS
-}' "$@"