binaryurp: silently ignore superfluous MUSTREPLY/SYNCHRONOUS flags

...in a non-oneway call.  This can happen when a pre LO 4 entity is calling a
LO 4 entity post 90eac3e69749a9227c4b6902b1f3cef1e338c6d1
"API CHANGE remove [oneway] method attributes."  (See mail thread starting at
<http://mail-archives.apache.org/mod_mbox/openoffice-api/201311.mbox/%3Ca4e7f34d-b8cb-4d5a-890f-6894d3410265%40ucimail2.uci.cu%3E>
"hi, code in Java.")

Change-Id: I9f800a979d84a95cc5cd96f75ee7472e8cf6cf4b
(cherry picked from commit 289e54feabc936b8175327355a159073830a326a)
Reviewed-on: https://gerrit.libreoffice.org/6835
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>