linux-user: be silent about capget failures

Complaining about capget doesn't buy us anything, but makes %check
fail in certain builds. So better not complain about its missing
implementation and go on with life :)

Signed-off-by: Alexander Graf <agraf@suse.de>

linux-user/syscall.c

@@ -7785,7 +7785,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
         unlock_user(p, arg1, ret);
         break;
     case TARGET_NR_capget:
-        goto unimplemented;
+        goto unimplemented_nowarn;
     case TARGET_NR_capset:
         goto unimplemented;
     case TARGET_NR_sigaltstack: