Add localversion-wireless to identify builds from this tree.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/localversion-wireless b/localversion-wireless
new file mode 100644
index 0000000..6a05d60
--- /dev/null
+++ b/localversion-wireless
@@ -0,0 +1 @@
+-wl