message: Detect all used functions from scripts/cmake
  Currently only usages of functions that were used in the portfile.cmake are found, extend this search to all cmake files in the port dir.
diff: @@ -1077,6 +1077,7 @@ namespace vcpkg::Build
  // just mark the port as no-hash
  const int max_port_file_count = 100;
  + std::string portfile_cmake_contents;
  auto&& port_dir = action.source_control_file_and_location.value_or_exit(VCPKG_LINE_INFO).source_location;
  size_t port_file_count = 0;
  for (auto& port_file : fs.get_regular_files_recursive(port_dir, VCPKG_LINE_INFO))
  @@ -1084,7 +1085,10 @@ namespace vcpkg::Build
  abi_tag_entries.emplace_back(
  port_file.filename(),
  vcpkg::Hash::get_file_hash(VCPKG_LINE_INFO, fs, port_file, Hash::Algorithm::Sha256));
  -
  + if (port_file.extension() == ".cmake")
  + {
  + portfile_cmake_contents += fs.read_contents(port_file, VCPKG_LINE_INFO);
  + }
  ++port_file_count;
  if (port_file_count > max_port_file_count)
  {
  @@ -1100,10 +1104,9 @@ namespace vcpkg::Build
  #endif
  auto& helpers = paths.get_cmake_script_hashes();
  - auto portfile_contents = fs.read_contents(port_dir / "portfile.cmake", VCPKG_LINE_INFO);
  for (auto&& helper : helpers)
  {
  - if (Strings::case_insensitive_ascii_contains(portfile_contents, helper.first))
  + if (Strings::case_insensitive_ascii_contains(portfile_cmake_contents, helper.first))
  {
  abi_tag_entries.emplace_back(helper.first, helper.second);
  }
  