cmd/swarm: disable export and upload tests on Windows

cmd/swarm/export_test.go

@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
 
+// +build !windows
+
 package main
 
 import (

cmd/swarm/upload_test.go

@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
 
+// +build !windows
+
 package main
 
 import (