env.bash: fix building in directory with spaces in the path.
Fixes #1122.
Thanks to BigBoss1964 for the solution.
R=golang-dev, r2
CC=golang-dev
https://golang.org/cl/2246042
diff --git a/src/env.bash b/src/env.bash
index d96d50c..40a94d6 100644
--- a/src/env.bash
+++ b/src/env.bash
@@ -15,7 +15,7 @@
# Various aspects of the build cd into $GOROOT-rooted paths,
# making it easy to jump to a different tree and get confused.
DIR1=$(cd ..; pwd)
-DIR2=$(cd $GOROOT; pwd)
+DIR2=$(cd "$GOROOT"; pwd)
if [ "$DIR1" != "$DIR2" ]; then
echo 'Suspicious $GOROOT '$GOROOT': does not match current directory.' 1>&2
exit 1
