message: Add support for msvc v143 toolset
diff: @@ -16,6 +16,7 @@ namespace vcpkg::VisualStudio
  static constexpr CStringView V_140 = "v140";
  static constexpr CStringView V_141 = "v141";
  static constexpr CStringView V_142 = "v142";
  + static constexpr CStringView V_143 = "v143";
  struct VisualStudioInstance
  {
  @@ -259,6 +260,11 @@ namespace vcpkg::VisualStudio
  toolset_version = V_142;
  vcvars_option = "-vcvars_ver=14.2";
  }
  + else if (toolset_version_prefix[3] == '3')
  + {
  + toolset_version = V_143;
  + vcvars_option = "-vcvars_ver=14.3";
  + }
  else
  {
  // unknown toolset minor version
  