Fix engine key support in utilities.

Reviewed-by: Rich Salz <rsalz@openssl.org>

apps/rsautl.c

@@ -86,7 +86,7 @@ OPTIONS rsautl_options[] = {
     {"help", OPT_HELP, '-', "Display this summary"},
     {"in", OPT_IN, '<', "Input file"},
     {"out", OPT_OUT, '>', "Output file"},
-    {"inkey", OPT_INKEY, '<', "Input key"},
+    {"inkey", OPT_INKEY, 's', "Input key"},
     {"keyform", OPT_KEYFORM, 'E', "Private key format - default PEM"},
     {"pubin", OPT_PUBIN, '-', "Input is an RSA public"},
     {"certin", OPT_CERTIN, '-', "Input is a cert carrying an RSA public key"},