Install Android NDK r25b on Windows VM (#1965)

#1962

buildkite/setup-windows.ps1

@@ -195,17 +195,31 @@ New-Item "c:\bazel" -ItemType "directory" -Force
 $env:PATH = [Environment]::GetEnvironmentVariable("PATH", "Machine") + ";c:\bazel"
 [Environment]::SetEnvironmentVariable("PATH", $env:PATH, "Machine")
 
-## Download the Android NDK and install into C:\android-ndk-r15c.
+## Download the Android NDK r15c and install into C:\android-ndk\r15c.
+Write-Host "Installing Android NDK r15c..."
 $android_ndk_url = "https://dl.google.com/android/repository/android-ndk-r15c-windows-x86_64.zip"
 $android_ndk_zip = "c:\temp\android_ndk.zip"
 $android_ndk_root = "c:\android_ndk"
 New-Item $android_ndk_root -ItemType "directory" -Force
 (New-Object Net.WebClient).DownloadFile($android_ndk_url, $android_ndk_zip)
 [System.IO.Compression.ZipFile]::ExtractToDirectory($android_ndk_zip, $android_ndk_root)
 Rename-Item "${android_ndk_root}\android-ndk-r15c" -NewName "r15c"
+Remove-Item $android_ndk_zip
+
+Write-Host "Installing Android NDK r25b..."
+## Download the Android NDK r25b and install into C:\android-ndk\r25b.
+$android_ndk_url = "https://dl.google.com/android/repository/android-ndk-r25b-windows.zip"
+$android_ndk_zip = "c:\temp\android_ndk.zip"
+$android_ndk_root = "c:\android_ndk"
+New-Item $android_ndk_root -ItemType "directory" -Force
+(New-Object Net.WebClient).DownloadFile($android_ndk_url, $android_ndk_zip)
+[System.IO.Compression.ZipFile]::ExtractToDirectory($android_ndk_zip, $android_ndk_root)
+Rename-Item "${android_ndk_root}\android-ndk-r25b" -NewName "r25b"
+Remove-Item $android_ndk_zip
+
+## Set the ANDROID_NDK_HOME environment variable to r15c.
 [Environment]::SetEnvironmentVariable("ANDROID_NDK_HOME", "${android_ndk_root}\r15c", "Machine")
 $env:ANDROID_NDK_HOME = [Environment]::GetEnvironmentVariable("ANDROID_NDK_HOME", "Machine")
-Remove-Item $android_ndk_zip
 
 ## Download the Android SDK and install into C:\android_sdk.
 $android_sdk_url = "https://dl.google.com/android/repository/commandlinetools-win-7302050_latest.zip"