Windows: Pass temp environment through

Signed-off-by: John Howard <jhoward@microsoft.com>

hack/make.sh

@@ -219,6 +219,7 @@ test_env() {
 		GOPATH="$GOPATH" \
 		HOME="$DEST/fake-HOME" \
 		PATH="$PATH" \
+		TEMP="$TEMP" \
 		TEST_DOCKERINIT_PATH="$TEST_DOCKERINIT_PATH" \
 		"$@"
 }