message: use cmake helpers for http parser library
diff: @@ -296,14 +296,12 @@ install(TARGETS scenario_perf_client DESTINATION bin)
  # HTTP parser
  add_enclave_library_c(http_parser.enclave "${HTTP_PARSER_SOURCES}")
  -set_property(TARGET http_parser.enclave PROPERTY POSITION_INDEPENDENT_CODE ON)
  install(
  TARGETS http_parser.enclave
  EXPORT ccf
  DESTINATION lib
  )
  -add_library(http_parser.host "${HTTP_PARSER_SOURCES}")
  -set_property(TARGET http_parser.host PROPERTY POSITION_INDEPENDENT_CODE ON)
  +add_host_library(http_parser.host "${HTTP_PARSER_SOURCES}")
  install(
  TARGETS http_parser.host
  EXPORT ccf
  