Bug 1387199 - Spidermonkey export VSPATH for taskcluster windows support. r=gps

MozReview-Commit-ID: JT3r5ouhBOP

--HG--
extra : rebase_source : 19ed07d03865a51b33458844fae62605d50d76ad

js/src/devtools/automation/winbuildenv.sh

@@ -10,7 +10,7 @@ topsrcdir="$SOURCE"
 # Tooltool installs in parent of topsrcdir for spidermonkey builds.
 # Resolve that path since the mozconfigs assume tooltool installs in
 # topsrcdir.
-VSPATH="$(cd ${topsrcdir}/.. && pwd)/vs2015u3"
+export VSPATH="$(cd ${topsrcdir}/.. && pwd)/vs2015u3"
 
 # When running on a developer machine, several variables will already
 # have the right settings and we will need to keep them since the