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Steps for C dissector 2.4 -> 2.6 migration? (e.g. linker errors)

I have a Wireshark 2.4 private dissector plugin written in C which is running like a charm. Now that Wireshark 2.6 is out, I want to upgrade my source code to support the new version, but I'm quite struggling with the transition. Is there a guide or "developer release notes" that I can read to get the changes and use to adjust my code and build configuration to match the new standard?

I already solved some problems with comparing to other dissectors, but I can't solve this: During compilation I get this linker error:

packet-protocolname.obj : error LNK2019: unresolved external symbol __imp_proto_register_protocol referenced in function proto_register_protocolname

From other dissectors I see that there _wireshark.lib_, wiretap.lib, wsutil.lib are included in linker, but not in my dissector. If I want to add them to my dissector using these lines in my CMakeLists.txt:

target_link_libraries(../../../run/$(ConfigurationName)/wireshark.lib)
target_link_libraries(../../../run/$(ConfigurationName)/wiretap.lib)
target_link_libraries(../../../run/$(ConfigurationName)/wsutil.lib)

I get this error message:

>  Cannot specify link libraries for target
>  "../../../run/$(ConfigurationName)/wireshark.lib" which is not built by this project.

This is my current CMakeLists.txt:

include(WiresharkPlugin)

# Plugin name and version info (major minor micro extra)
set_module_info(protocolname 0 1 2 3)

set(DISSECTOR_SRC
    packet-protocolname.c
)

set(PLUGIN_FILES
    ${DISSECTOR_SRC}
)

set(CLEAN_FILES
    ${PLUGIN_FILES}
)

if (WERROR_COMMON_FLAGS)
    set_source_files_properties(
        ${CLEAN_FILES}
        PROPERTIES
        COMPILE_FLAGS ${WERROR_COMMON_FLAGS}
    )
endif()

include_directories(${CMAKE_CURRENT_SOURCE_DIR})
include_directories(some/directory/i/need)

set(CUSTOM_DISSECTOR_SRC
    ${DISSECTOR_SRC}
)

add_plugin_library(protocolname protocolname)

get_filename_component(_dll_output_dir "${_libwireshark_location}" PATH)
file (TO_NATIVE_PATH "${_dll_output_dir}" _dll_output_dir_win )
add_custom_command(TARGET protocolname PRE_BUILD
    [... some command I need]
)


install(TARGETS protocolname
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}/${CPACK_PACKAGE_NAME}/plugins/${CPACK_PACKAGE_VERSION} NAMELINK_SKIP
    RUNTIME DESTINATION ${CMAKE_INSTALL_LIBDIR}/${CPACK_PACKAGE_NAME}/plugins/${CPACK_PACKAGE_VERSION}
    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}/${CPACK_PACKAGE_NAME}/plugins/${CPACK_PACKAGE_VERSION}
)

file(GLOB DISSECTOR_HEADERS RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" "*.h")
CHECKAPI(
    NAME
      protocolname
    SWITCHES
      -g abort -g termoutput -build
    SOURCES
      ${DISSECTOR_SRC}
      ${DISSECTOR_HEADERS}
)

I'm on Windows, switched from Wireshark 2.4 (Visual Studio 2013) to Wireshark 2.6 (Visual Studio 2017)

Thanks in advance!