CMake: add linking of G4 to the interface macro

# Enable Geant4 interface library requirement

MACRO(ALLPIX_MODULE_REQUIRE_GEANT4_INTERFACE name)

    SET(options REQUIRED)

    SET(oneValueArgs "")

    SET(multiValueArgs COMPONENTS)

    CMAKE_PARSE_ARGUMENTS(GEANT "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})

    SET(ALLPIX_BUILD_GEANT4_INTERFACE

        "ON"

        CACHE BOOL "Build Geant4 interface library" FORCE)

    TARGET_LINK_LIBRARIES(${name} ${ALLPIX_GEANT4_INTERFACE})

    IF(GEANT_REQUIRED)

        FIND_PACKAGE(Geant4 REQUIRED COMPONENTS "${GEANT_COMPONENTS}")

    ELSE()

        FIND_PACKAGE(Geant4 COMPONENTS "${GEANT_COMPONENTS}")

    ENDIF()

    IF(NOT Geant4_FOUND)

        MESSAGE(FATAL_ERROR "Could not find Geant4, make sure to source the Geant4 environment\n"

                            "$ source YOUR_GEANT4_DIR/bin/geant4.sh")

    ENDIF()

    # Add "geant4.sh" as runtime dependency for setup.sh file:

    ADD_RUNTIME_DEP(geant4.sh)

    # Add Geant4 flags before our own flags

    ADD_DEFINITIONS(${Geant4_DEFINITIONS})

    SET(CMAKE_CXX_FLAGS "${Geant4_CXX_FLAGS} ${CMAKE_CXX_FLAGS}")

    IF(CMAKE_BUILD_TYPE MATCHES DEBUG)

        SET(CMAKE_CXX_FLAGS "${Geant4_CXX_FLAGS_DEBUG} ${CMAKE_CXX_FLAGS}")

    ELSEIF(CMAKE_BUILD_TYPE MATCHES RELEASE)

        SET(CMAKE_CXX_FLAGS "${Geant4_CXX_FLAGS_RELEASE} ${CMAKE_CXX_FLAGS}")

    ENDIF()

    # Add GDML flag if supported

    IF(Geant4_gdml_FOUND)

        ADD_DEFINITIONS(-DGeant4_GDML)

    ENDIF()

    # Include Geant4 directories (NOTE Geant4_USE_FILE is not used!)

    TARGET_INCLUDE_DIRECTORIES(${MODULE_NAME} SYSTEM PRIVATE ${Geant4_INCLUDE_DIRS})

    # Add Geant4 libraries

    TARGET_LINK_LIBRARIES(${MODULE_NAME} ${Geant4_LIBRARIES})

ENDMACRO()

# Macro to set up ROOT:: targets so that we can use the same code for root 6.8 and for root 6.10 and beyond