Add proper filesystem check for NetBSD

FreeBSD and NetBSD are compatible here.

src/shared.py

@@ -423,8 +423,8 @@ def checkSensitiveFilePermissions(filename):
         # TODO: This might deserve extra checks by someone familiar with
         # Windows systems.
         return True
-    elif sys.platform[:7] == 'freebsd':
-        # FreeBSD file systems are the same as major Linux file systems
+    elif sys.platform[:7] == 'freebsd' or sys.platform[:6] == 'netbsd':
+        # The BSD file systems are the same as major Linux file systems
         present_permissions = os.stat(filename)[0]
         disallowed_permissions = stat.S_IRWXG | stat.S_IRWXO
         return present_permissions & disallowed_permissions == 0