Fix the CMake QT build

The HAVE_PCAP_REMOTE definition is in config.h, so the .h files
that depend on the definition must include it so the MOC compiler
will generate the required code.

Change-Id: Ifc17db4fc3f0e3323726792308e303d28d8bcc7f
Reviewed-on: https://code.wireshark.org/review/3516
Reviewed-by: Evan Huus <eapache@gmail.com>