message: Add -all flag to vswhere.exe call
diff: @@ -82,7 +82,7 @@ namespace vcpkg::VisualStudio
  if (fs.exists(vswhere_exe))
  {
  const auto code_and_output = System::cmd_execute_and_capture_output(
  - Strings::format(R"("%s" -prerelease -legacy -products * -format xml)", vswhere_exe.u8string()));
  + Strings::format(R"("%s" -all -prerelease -legacy -products * -format xml)", vswhere_exe.u8string()));
  Checks::check_exit(VCPKG_LINE_INFO,
  code_and_output.exit_code == 0,
  "Running vswhere.exe failed with message:\n%s",
  