compiler: add retry loop and enable allowEmptyChecksums on Windows (#12962)

Enables allowEmptyChecksums globally on Chocolatey and implements a
3-attempt retry loop for pkgconfiglite to prevent Windows CI failures
caused by transient network or SourceForge mirror errors. Even though
--allow-empty-checksums is passed to choco install, newer Chocolatey
versions do not propagate this CLI flag to the nested PowerShell
installer script (chocolateyInstall.ps1). The inner script fails when
downloading the binary from non-secure HTTP SourceForge mirrors unless
the allowEmptyChecksums feature is globally enabled via choco feature
beforehand.
This change also makes the script exit prematurely if pkg-config
installation still failed instead of continuing and failing later at the
linking step.

[Failed Kokoro build logs
example](https://btx.cloud.google.com/invocations/f43affbc-6ace-4158-bac4-86779b985b2f/targets/grpc%2Fjava%2Fmaster%2Fpresubmit%2Fwindows;config=default/log).

Author: kannanjgithub

buildscripts/make_dependencies.bat

@@ -1,4 +1,20 @@
-choco install -y pkgconfiglite --allow-empty-checksums
+choco feature enable -n allowEmptyChecksums
+
+set RETRY=0
+:install_pkgconfig
+choco install -y pkgconfiglite --allow-empty-checksums --force
+if %ERRORLEVEL% neq 0 (
+  if %RETRY% lss 3 (
+    set /a RETRY=%RETRY%+1
+    echo pkgconfiglite installation failed. Retrying %RETRY% of 3 in 5 seconds...
+    @rem Sleep for 5 seconds using the loopback ping trick (timeout command fails in non-interactive CI)
+    ping -n 6 127.0.0.1 >nul
+    goto :install_pkgconfig
+  )
+  echo Failed to install pkgconfiglite after 3 attempts.
+  exit /b 1
+)
+
 choco install -y openjdk --version=17.0
 set PATH=%PATH%;"c:\Program Files\OpenJDK\jdk-17\bin"
 set PROTOBUF_VER=35.1
@@ -24,11 +40,11 @@ if not exist "%CMAKE_NAME%" (
 set PATH=%PATH%;%cd%\%CMAKE_NAME%\bin
 :hasCmake
 @rem GitHub requires TLSv1.2, and for whatever reason our powershell doesn't have it enabled
-powershell -command "$ProgressPreference = 'SilentlyContinue'; $ErrorActionPreference = 'stop'; & { [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 ; iwr https://github.com/google/protobuf/releases/download/v%PROTOBUF_VER%/protobuf-%PROTOBUF_VER%.zip -OutFile protobuf.zip }" || exit /b 1
-powershell -command "$ErrorActionPreference = 'stop'; & { Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory('protobuf.zip', '.') }" || exit /b 1
+call :RunPowershellWithRetry "$ProgressPreference = 'SilentlyContinue'; $ErrorActionPreference = 'stop'; & { [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 ; iwr https://github.com/google/protobuf/releases/download/v%PROTOBUF_VER%/protobuf-%PROTOBUF_VER%.zip -OutFile protobuf.zip }" || exit /b 1
+call :RunPowershellWithRetry "$ErrorActionPreference = 'stop'; & { Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory('protobuf.zip', '.') }" || exit /b 1
 del protobuf.zip
-powershell -command "$ProgressPreference = 'SilentlyContinue'; $ErrorActionPreference = 'stop'; & { [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 ; iwr https://github.com/abseil/abseil-cpp/archive/refs/tags/%ABSL_VERSION%.zip -OutFile absl.zip }" || exit /b 1
-powershell -command "$ErrorActionPreference = 'stop'; & { Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory('absl.zip', '.') }" || exit /b 1
+call :RunPowershellWithRetry "$ProgressPreference = 'SilentlyContinue'; $ErrorActionPreference = 'stop'; & { [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 ; iwr https://github.com/abseil/abseil-cpp/archive/refs/tags/%ABSL_VERSION%.zip -OutFile absl.zip }" || exit /b 1
+call :RunPowershellWithRetry "$ErrorActionPreference = 'stop'; & { Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory('absl.zip', '.') }" || exit /b 1
 del absl.zip
 move abseil-cpp-%ABSL_VERSION% protobuf-%PROTOBUF_VER%\third_party\abseil-cpp
 mkdir protobuf-%PROTOBUF_VER%\build
@@ -58,8 +74,25 @@ goto :eof
 
 :installCmake
 
-powershell -command "$ErrorActionPreference = 'stop'; & { iwr https://cmake.org/files/v3.3/%CMAKE_NAME%.zip -OutFile cmake.zip }" || exit /b 1
-powershell -command "$ErrorActionPreference = 'stop'; & { Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory('cmake.zip', '.') }" || exit /b 1
+call :RunPowershellWithRetry "$ErrorActionPreference = 'stop'; & { iwr https://cmake.org/files/v3.3/%CMAKE_NAME%.zip -OutFile cmake.zip }" || exit /b 1
+call :RunPowershellWithRetry "$ErrorActionPreference = 'stop'; & { Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory('cmake.zip', '.') }" || exit /b 1
 del cmake.zip
 goto :eof
 
+@rem Helper to retry powershell commands (e.g. for transient network failures during iwr)
+:RunPowershellWithRetry
+set "PS_CMD=%~1"
+set PS_RETRY=0
+:ps_retry_loop
+powershell -command "%PS_CMD%"
+if %ERRORLEVEL% equ 0 exit /b 0
+if %PS_RETRY% lss 3 (
+  set /a PS_RETRY=%PS_RETRY%+1
+  echo PowerShell command failed. Retrying %PS_RETRY% of 3 in 5 seconds...
+  ping -n 6 127.0.0.1 >nul
+  goto :ps_retry_loop
+)
+echo PowerShell command failed after 3 attempts: %PS_CMD%
+exit /b 1
+
+