build: get rid of deps.bash

It doesn't work anymore and it's not used.

R=golang-dev, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/5652073

src/pkg/deps.bash

-#!/usr/bin/env bash
-# Copyright 2009 The Go Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-
-eval $(gomake --no-print-directory -f ../Make.inc go-env)
-
-OUT="Make.deps"
-TMP="Make.deps.tmp"
-
-if [ -f $OUT ] && ! [ -w $OUT ]; then
-	echo "$0: $OUT is read-only; aborting." 1>&2
-	exit 1
-fi
-
-# Get list of directories from Makefile
-dirs=$(gomake --no-print-directory echo-dirs)
-dirpat=$(echo $dirs C | awk '{
-	for(i=1;i<=NF;i++){ 
-		x=$i
-		gsub("/", "\\/", x)
-		printf("/^(%s)$/\n", x)
-	}
-}')
-
-for dir in $dirs; do (
-	cd $dir >/dev/null || exit 1
-
-	sources=$(sed -n 's/^[ 	]*\([^ 	]*\.go\)[ 	]*\\*[ 	]*$/\1/p' Makefile)
-	sources=$(echo $sources | sed 's/\$(GOOS)/'$GOOS'/g')
-	sources=$(echo $sources | sed 's/\$(GOARCH)/'$GOARCH'/g')
-	# /dev/null here means we get an empty dependency list if $sources is empty
-	# instead of listing every file in the directory.
-	sources=$(ls $sources /dev/null 2> /dev/null)  # remove .s, .c, etc.
-
-	deps=$(
-		sed -n '/^import.*"/p; /^import[ \t]*(/,/^)/p' $sources /dev/null |
-		cut -d '"' -f2 |
-		awk "$dirpat" |
-		grep -v "^$dir\$" |
-		sed 's/$/.install/' |
-		sed 's;^C\.install;runtime/cgo.install;' |
-		sort -u
-	)
-
-	echo $dir.install: $deps
-) done > $TMP
-
-mv $TMP $OUT
-
-if (egrep -v '^(exp|old)/' $OUT | egrep -q " (exp|old)/"); then
-	echo "$0: $OUT contains dependencies to exp or old packages"
-        exit 1
-fi