tools: drop unused --version argument

These tools never supported passing an argument to --version, this is
a copy+paste mistake from virsh, which did support an argument.

Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

tools/virt-login-shell-helper.c

@@ -180,7 +180,7 @@ main(int argc, char **argv)
 
     struct option opt[] = {
         { "help", no_argument, NULL, 'h' },
-        { "version", optional_argument, NULL, 'V' },
+        { "version", no_argument, NULL, 'V' },
         { NULL, 0, NULL, 0 },
     };
     if (virInitialize() < 0) {

tools/virt-pki-query-dn.c

@@ -62,7 +62,7 @@ main(int argc,
 
     struct option opt[] = {
         { "help", no_argument, NULL, 'h' },
-        { "version", optional_argument, NULL, 'v' },
+        { "version", no_argument, NULL, 'v' },
         { NULL, 0, NULL, 0 },
     };