Update CMakeLists.txt

Fix bug: ethernet_win32.c line 52, include 'pcap.h': there is no such file or directory, when using winpcap - Goose

hal/CMakeLists.txt

@@ -26,6 +26,7 @@ if(WIN32)
 if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../third_party/winpcap/Lib/wpcap.lib")
 message("Found winpcap -> compile ethernet HAL layer (required for GOOSE/SV support)")
 set(WITH_WPCAP 1)
+include_directories(../third_party/winpcap/include)
 else()
 message("winpcap not found -> skip ethernet HAL layer (no GOOSE/SV support)")
 endif()