apps: when the 'compat' nameopt has been set, leave it be

XN_FLAG_COMPAT has a unique property, its zero for value.  This means
it needs special treatment; if it has been set (which can only be
determined indirectly) and set alone (*), no other flags should be
set.

(*) if any other nameopt flag has been set by the user, compatibility
mode is blown away.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6382)

apps/apps.c

diff --git a/apps/apps.c b/apps/apps.c
index d5a6aea..2740275 100644
--- a/apps/apps.c
+++ b/apps/apps.c
@@ -1050,7 +1050,8 @@
     };
     if (set_multi_opts(flags, arg, ex_tbl) == 0)
         return 0;
-    if ((*flags & XN_FLAG_SEP_MASK) == 0)
+    if (*flags != XN_FLAG_COMPAT
+        && (*flags & XN_FLAG_SEP_MASK) == 0)
         *flags |= XN_FLAG_SEP_CPLUS_SPC;
     return 1;
 }