scripts: replacing scripts/build/go with "veyron go"

Change-Id: Ie5c3399ddc1c44664368c23fb2f258cf697b5276
diff --git a/runtimes/google/ipc/stream/crypto/tls_generate_old.sh b/runtimes/google/ipc/stream/crypto/tls_generate_old.sh
index 66a23c5..b940345 100755
--- a/runtimes/google/ipc/stream/crypto/tls_generate_old.sh
+++ b/runtimes/google/ipc/stream/crypto/tls_generate_old.sh
@@ -25,7 +25,7 @@
     sed -e 's|// +build go1.4|// +build !go1.4|' |
     sed -e 's|"crypto/tls"|tls "veyron.io/veyron/veyron/runtimes/google/ipc/stream/crypto/tlsfork"|' >>$OUTFILE
 
-  "${VEYRON_ROOT}/scripts/build/go" fmt "${OUTFILE}"
+  veyron go fmt "${OUTFILE}"
 }
 
 main "$@"