Kill LOCAL_SOCKET_NAMESPACE.

Change-Id: I18928f89f66c37be310c45ff4c05a6d47ab84f66
diff --git a/libcutils/socket_local_server.c b/libcutils/socket_local_server.c
index 7628fe4..60eb86b 100644
--- a/libcutils/socket_local_server.c
+++ b/libcutils/socket_local_server.c
@@ -66,7 +66,7 @@
     }
 
     /* basically: if this is a filesystem path, unlink first */
-#ifndef HAVE_LINUX_LOCAL_SOCKET_NAMESPACE
+#if !defined(__linux__)
     if (1) {
 #else
     if (namespaceId == ANDROID_SOCKET_NAMESPACE_RESERVED