Relicense to GPL

internal/osutil/hidden_unix.go

@@ -1,6 +1,17 @@
 // Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
-// All rights reserved. Use of this source code is governed by an MIT-style
-// license that can be found in the LICENSE file.
+//
+// This program is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+// more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program. If not, see <http://www.gnu.org/licenses/>.
 
 // +build !windows