cmd/dist: fix GOROOT_FINAL

R=rsc, gustavo
CC=golang-dev
https://golang.org/cl/5642045

src/make.bash

diff --git a/src/make.bash b/src/make.bash
index 32a91a2..55a292e 100755
--- a/src/make.bash
+++ b/src/make.bash
@@ -47,7 +47,9 @@
 
 echo '# Building C bootstrap tool.'
 mkdir -p ../bin/tool
-DEFGOROOT='-DDEFAULT_GOROOT="'"$(cd .. && pwd)"'"'
+export GOROOT="$(cd .. && pwd)"
+GOROOT_FINAL="${GOROOT_FINAL:-$GOROOT}"
+DEFGOROOT='-DGOROOT_FINAL="'"$GOROOT_FINAL"'"'
 gcc -O2 -Wall -Werror -o ../bin/tool/dist -Icmd/dist "$DEFGOROOT" cmd/dist/*.c
 echo