Use a wildcard to exclude all Wireshark (GUI) binaries: rpmbuild in RHEL6
errors out if you %exclude a file that's not there.

Fixes the issue reported by Chris on the -dev list.

Change-Id: If8d8b6a9ee69c3d94756b729a809f3c04fc2517f
Reviewed-on: https://code.wireshark.org/review/3586
Reviewed-by: Christopher Maynard <Christopher.Maynard@gtech.com>
Petri-Dish: Christopher Maynard <Christopher.Maynard@gtech.com>