message: platform expressions: windows should also be true for mingw systems
diff: @@ -389,7 +389,8 @@ namespace vcpkg::PlatformExpression
  case Identifier::arm64: return true_if_exists_and_equal("VCPKG_TARGET_ARCHITECTURE", "arm64");
  case Identifier::windows:
  return true_if_exists_and_equal("VCPKG_CMAKE_SYSTEM_NAME", "") ||
  - true_if_exists_and_equal("VCPKG_CMAKE_SYSTEM_NAME", "WindowsStore");
  + true_if_exists_and_equal("VCPKG_CMAKE_SYSTEM_NAME", "WindowsStore") ||
  + true_if_exists_and_equal("VCPKG_CMAKE_SYSTEM_NAME", "MinGW");
  case Identifier::mingw: return true_if_exists_and_equal("VCPKG_CMAKE_SYSTEM_NAME", "MinGW");
  case Identifier::linux: return true_if_exists_and_equal("VCPKG_CMAKE_SYSTEM_NAME", "Linux");
  case Identifier::osx: return true_if_exists_and_equal("VCPKG_CMAKE_SYSTEM_NAME", "Darwin");
  