Fix coredistools download script now that Packages layout has changed

Fixes dotnet/coreclr#18321


Commit migrated from dotnet/coreclr@d2e2299

src/coreclr/tests/setup-stress-dependencies.cmd

@@ -81,7 +81,7 @@ if errorlevel 1 goto Fail
 
 REM Get downloaded dll path
 echo Locating coredistools.dll
-FOR /F "delims=" %%i IN ('dir %__PackageDir%\coredistools.dll /b/s ^| findstr /R "runtime.win[0-9]*-%__Arch%"') DO set __LibPath=%%i
+FOR /F "delims=" %%i IN ('dir %__PackageDir%\coredistools.dll /b/s ^| findstr /R "win[0-9]*-%__Arch%"') DO set __LibPath=%%i
 echo CoreDisTools library path: %__LibPath%
 if not exist "%__LibPath%" (
     echo Failed to locate the downloaded library: %__LibPath%
@@ -114,4 +114,4 @@ echo.
 echo Usage:
 echo     %__ThisScriptShort% /arch ^<TargetArch^> /outputdir ^<coredistools_lib_install_path^>
 echo.
-exit /b 1
+exit /b 1