Add CMake tests for pcap_datalink_val_to_description() and

Add CMake tests for pcap_datalink_val_to_description() and
pcap_free_datalinks().

Sort the CMake tests in cmake/modules/FindPCAP.cmake into the same order
as the tests in the autoconf script, and note that, in the autoconf
script, the checks for pcap_open_dead() and pcap_freecode() do more than
just look for the routines in the library.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@32225 f5534014-38df-0310-8fa8-9805f1628bb7