message: handling header-only envoy_cc_test_library better
diff: @@ -221,6 +221,12 @@ def envoy_cc_test_library(
  deps = deps + [
  repository + "//test/test_common:printers_includes",
  ]
  +
  + # Same as envoy_cc_library
  + srcs += select({
  + "@envoy//bazel:compdb_build": ["@envoy//bazel/external:empty.cc"],
  + "//conditions:default": [],
  + })
  _envoy_cc_test_infrastructure_library(
  name,
  srcs,
  