xend: remove PCI device listing from NetBSD, since it's Linux

specific code.

Signed-off-by: Roger Pau Monne <roger.pau@entel.upc.edu>
xen-unstable changeset:   23738:88847c424eec
xen-unstable date:        Sat Jul 23 08:58:37 2011 +0100

tools/python/xen/util/pci.py

@@ -462,6 +462,7 @@ def find_sysfs_mnt():
     return None
 
 def get_all_pci_names():
+    if not sys.platform.startswith('linux'): return []
     sysfs_mnt = find_sysfs_mnt()
     if sysfs_mnt is None:
         return None