Don't assert that values fit in 32 bits if the NDR64 flag is set.

For now, this just pacifies fuzz-testing.  If real world examples have this, there needs to be a drastic overhaul to support fields that could be either 32 or 64-bit values.

Bug:9329
Change-Id: I3e28808ca0291868a5f84258b0ee1e2a922703c2
Reviewed-on: https://code.wireshark.org/review/4189
Reviewed-by: Michael Mann <mmann78@netscape.net>
(cherry picked from commit e489df5024acc86b0bd3c9f41844b06ff7560d24)
Change-Id: I3e28808ca0291868a5f84258b0ee1e2a922703c2
Reviewed-on: https://code.wireshark.org/review/4196
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>