message: Fix `libprotobuf` install
diff: @@ -15,7 +15,6 @@ add_subdirectory(${CCF_3RD_PARTY_EXPORTED_DIR}/protobuf EXCLUDE_FROM_ALL)
  add_custom_target(dummy ALL DEPENDS libprotobuf)
  get_target_property(LIBPROTOBUF_SOURCES libprotobuf SOURCES)
  -get_target_property(LIBPROTOBUF_INCLUDE_DIRS libprotobuf INCLUDE_DIRECTORIES)
  set(PROTOBUF_TARGETS "protobuf.virtual")
  add_host_library(protobuf.virtual ${LIBPROTOBUF_SOURCES})
  @@ -27,9 +26,11 @@ endif()
  foreach(TARGET ${PROTOBUF_TARGETS})
  target_include_directories(
  - ${TARGET} PUBLIC $<BUILD_INTERFACE:${LIBPROTOBUF_INCLUDE_DIRS}>
  + ${TARGET}
  + PUBLIC $<BUILD_INTERFACE:${CCF_3RD_PARTY_EXPORTED_DIR}/protobuf/src>
  $<INSTALL_INTERFACE:include/3rdparty/protobuf>
  )
  +
  target_compile_options(
  ${TARGET}
  PUBLIC
  