message: Search into the `src/` subdir for BoringSSL's CMake config and specify only BUILD_INTERFACE for BoringSSL's includes
  The latter is because we are only concerned about the build tree of `crypto`.
diff: @@ -95,10 +95,12 @@ if (NOT TINK_USE_SYSTEM_OPENSSL)
  NAME boringssl
  URL https://github.com/google/boringssl/archive/d345d68d5c4b5471290ebe13f090f1fd5b7e8f58.zip
  SHA256 482796f369c8655dbda3be801ae98c47916ecd3bff223d007a723fd5f5ecba22
  + CMAKE_SUBDIR src
  )
  # BoringSSL targets do not carry include directory info, this fixes it.
  - target_include_directories(crypto PUBLIC "${boringssl_SOURCE_DIR}/src/include")
  + target_include_directories(crypto PUBLIC
  + "$<BUILD_INTERFACE:${boringssl_SOURCE_DIR}/src/include>")
  else()
  # Support for ED25519 was added from 1.1.1.
  find_package(OpenSSL 1.1.1 REQUIRED)
  