utils: begin supporting new NDKs when building

Add support for multiple NDKs for Android SDKs to be built. This is in
preparation to migrate to r27c as the default NDK to use.

Author: compnerd

utils/build.ps1

@@ -139,7 +139,7 @@ param
   [string] $PinnedToolchainVariant = "Asserts",
   [string] $PythonVersion = "3.9.10",
   [ValidatePattern("^r(?:[1-9]|[1-9][0-9])(?:[a-z])?$")]
-  [string] $AndroidNDKVersion = "r26b",
+  [string] $AndroidNDKVersion = "r27c",
   [ValidatePattern("^\d+\.\d+\.\d+(?:-\w+)?")]
   [string] $WinSDKVersion = "",
   [switch] $Android = $false,
@@ -351,8 +351,7 @@ $IsCrossCompiling = $HostArchName -ne $BuildArchName
 $TimingData = New-Object System.Collections.Generic.List[System.Object]
 
 function Get-AndroidNDKPath {
-  $androidNDKPath = Join-Path -Path $BinaryCache -ChildPath "android-ndk-$AndroidNDKVersion"
-  return $androidNDKPath
+  return Join-Path -Path $BinaryCache -ChildPath "android-ndk-$AndroidNDKVersion"
 }
 
 function Get-FlexExecutable {
@@ -855,14 +854,23 @@ function Fetch-Dependencies {
   Install-PythonModules
 
   if ($Android) {
-    # Only a specific NDK version is supported right now.
-    if ($AndroidNDKVersion -ne "r26b") {
+    $KnownNDKs = @{
+      r26b = @{
+        URL = "https://dl.google.com/android/repository/android-ndk-r26b-windows.zip"
+        SHA256 = "A478D43D4A45D0D345CDA6BE50D79642B92FB175868D9DC0DFC86181D80F691E"
+      }
+      r27c = @{
+        URL = "https://dl.google.com/android/repository/android-ndk-r27c-windows.zip"
+        SHA256 = ""
+      }
+    }
+
+    $NDK = $KnownNDKs[$AndroidNDKVersion]
+    if ($NDK -eq $null) {
       throw "Unsupported Android NDK version"
     }
-    $NDKURL = "https://dl.google.com/android/repository/android-ndk-r26b-windows.zip"
-    $NDKHash = "A478D43D4A45D0D345CDA6BE50D79642B92FB175868D9DC0DFC86181D80F691E"
-    DownloadAndVerify $NDKURL "$BinaryCache\android-ndk-$AndroidNDKVersion-windows.zip" $NDKHash
 
+    DownloadAndVerify $NDK.URL "$BinaryCache\android-ndk-$AndroidNDKVersion-windows.zip" $NDK.SHA256
     Extract-ZipFile -ZipFileName "android-ndk-$AndroidNDKVersion-windows.zip" -BinaryCache $BinaryCache -ExtractPath "android-ndk-$AndroidNDKVersion" -CreateExtractPath $false
   }