Compile with pcap support by default

This will permit to get pcap debugging out of the box

DefineOptions.cmake

@@ -6,4 +6,4 @@ option(WITH_STATIC_LIB "Build with a static library" OFF)
 option(WITH_DEBUG_CRYPTO "Build with cryto debug output" OFF)
 option(WITH_DEBUG_CALLTRACE "Build with calltrace debug output" ON)
 option(WITH_GCRYPT "Compile against libgcrypt" OFF)
-option(WITH_PCAP "Compile with Pcap generation support" OFF)
+option(WITH_PCAP "Compile with Pcap generation support" ON)