Remove test for __linux__ in auth_gss.h.

It's not necessarily even true when cross-compiling the
kernel, and the right thing to do is check for __KERNEL__
(which we already do, one line up).

include/linux/sunrpc/auth_gss.h

@@ -15,11 +15,9 @@
 #define _LINUX_SUNRPC_AUTH_GSS_H
 
 #ifdef __KERNEL__
-#ifdef __linux__
 #include <linux/sunrpc/auth.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/sunrpc/gss_api.h>
-#endif
 
 #define RPC_GSS_VERSION		1