rpc: remove some unused macros

There used to be a print_hexl() function that used isprint(), now gone.
I don't know why NFS_NGROUPS and CA_RUN_AS_MACHINE were here.

I also don't know why another #define that's actually used was marked
"unused".
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

net/sunrpc/auth_gss/auth_gss.c

@@ -63,22 +63,11 @@ static const struct rpc_credops gss_nullops;
 # define RPCDBG_FACILITY	RPCDBG_AUTH
 #endif
 
-#define NFS_NGROUPS	16
-
-#define GSS_CRED_SLACK		1024		/* XXX: unused */
+#define GSS_CRED_SLACK		1024
 /* length of a krb5 verifier (48), plus data added before arguments when
  * using integrity (two 4-byte integers): */
 #define GSS_VERF_SLACK		100
 
-/* XXX this define must match the gssd define
-* as it is passed to gssd to signal the use of
-* machine creds should be part of the shared rpc interface */
-
-#define CA_RUN_AS_MACHINE  0x00000200
-
-/* dump the buffer in `emacs-hexl' style */
-#define isprint(c)      ((c > 0x1f) && (c < 0x7f))
-
 struct gss_auth {
 	struct kref kref;
 	struct rpc_auth rpc_auth;