[Java.Interop.BootstrapTasks] Filter out invalid JDKs (#1278)

@jonpryor's developer machines are a "weird", with a macOS arm64 box
containing the directories:

  * `$HOME/android-toolchain/jdk-17`
  * `$HOME/android-toolchain/jdk-17.x64`

Meanwhile, `XAPrepareJdkLocations.GetXAPrepareJdks()` within
dotnet/android-tools looks for all directories matching the glob
`$HOME/android-toolchains/jdk*`, and thus finds both.

For some reason, the JDK that `dotnet build -t:Prepare *.sln` winds
up using by default is the the `jdk-17.x64` directory (😱), which
cannot be loaded into an arm64 process.  This results in errors from
`dotnet build`:

	EXEC : error JM4003: jnimarshalmethod-gen: Unable to create Java VM […/dotnet/java-interop/samples/Hello-NativeAOTFromJNI/Hello-NativeAOTFromJNI.csproj]
	  System.DllNotFoundException: Unable to load shared library '$HOME/android-toolchain/jdk-17.x64/lib/libjli.dylib' or one of its dependencies. In order to help diagnose loading problems, consider setting the DYLD_PRINT_LIBRARIES environment variable:
	  dlopen($HOME/android-toolchain/jdk-17.x64/lib/libjli.dylib, 0x0001): tried: '$HOME/android-toolchain/jdk-17.x64/lib/libjli.dylib' (mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64e' or 'arm64')), '/System/Volumes/Preboot/Cryptexes/OS/$HOME/android-toolchain/jdk-17.x64/lib/libjli.dylib' (no such file), '$HOME/android-toolchain/jdk-17.x64/lib/libjli.dylib' (mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64e' or 'arm64'))
	     at System.Runtime.InteropServices.NativeLibrary.Load(String libraryPath)
	     at Java.Interop.NativeLibraryJvmLibraryHandler.LoadJvmLibrary(String path) in $HOME/Developer/src/dotnet/java-interop/src/Java.Runtime.Environment/Java.Interop/JreRuntime.cs:line 231
	     at Java.Interop.JreRuntime.CreateJreVM(JreRuntimeOptions builder) in $HOME/Developer/src/dotnet/java-interop/src/Java.Runtime.Environment/Java.Interop/JreRuntime.cs:line 104
	     at Java.Interop.JreRuntime..ctor(JreRuntimeOptions builder) in $HOME/Developer/src/dotnet/java-interop/src/Java.Runtime.Environment/Java.Interop/JreRuntime.cs:line 162
	     at Java.Interop.JreRuntimeOptions.CreateJreVM() in $HOME/Developer/src/dotnet/java-interop/src/Java.Runtime.Environment/Java.Interop/JreRuntime.cs:line 66
	     at Xamarin.Android.Tools.JniMarshalMethodGenerator.App.CreateJavaVM(String jvmDllPath) in $HOME/Developer/src/dotnet/java-interop/tools/jnimarshalmethod-gen/App.cs:line 302
	…
	…/dotnet/java-interop/samples/Hello-NativeAOTFromJNI/Hello-NativeAOTFromJNI.targets(44,5):
	  error MSB3073: The command ""/usr/local/share/dotnet/dotnet" "…/dotnet/java-interop/bin/Debug-net8.0//jnimarshalmethod-gen.dll" "…/dotnet/java-interop/samples/Hello-NativeAOTFromJNI/bin/Debug/Hello-NativeAOTFromJNI.dll" -v -v --keeptemp -L "…/dotnet/java-interop/samples/Hello-NativeAOTFromJNI/bin/Debug/" "
	  exited with code 3. […/dotnet/java-interop/samples/Hello-NativeAOTFromJNI/Hello-NativeAOTFromJNI.csproj]

Instead of doing the "obvious" of removing `jdk.x64` or renaming it
so it doesn't match the glob `jdk*`, update
`JdkInfo.GetKnownSystemJdkInfos()` and `JdkInfo.GetSupportedJdkInfos()`
to filter out JDKs that cannot be loaded into the current process.
This nicely filters out `jdk-17.x64`, allowing dotnet/java-interop
to build successfully.

build-tools/Java.Interop.BootstrapTasks/Java.Interop.BootstrapTasks.csproj

@@ -3,6 +3,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <LangVersion>11.0</LangVersion>
   </PropertyGroup>
 
   <Import Project="..\..\TargetFrameworkDependentValues.props" />

build-tools/Java.Interop.BootstrapTasks/Java.Interop.BootstrapTasks/JdkInfo.cs

@@ -5,6 +5,7 @@
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Xml.Linq;
@@ -46,6 +47,7 @@ public override bool Execute ()
 				.Where (j => maxVersion != null ? j.Version <= maxVersion : true)
 				.Where (j => j.IncludePath.Any ());
 			var jdk             = explicitJdks.Concat (defaultJdks)
+				.Where (j => JdkRunsOnHost (j))
 				.FirstOrDefault ();
 
 			if (jdk == null) {
@@ -71,6 +73,19 @@ public override bool Execute ()
 			return !Log.HasLoggedErrors;
 		}
 
+		static bool JdkRunsOnHost (XATInfo jdk)
+		{
+			var cputype = RuntimeInformation.ProcessArchitecture;
+			if (jdk.ReleaseProperties.TryGetValue ("OS_ARCH", out var arch)) {
+				return (cputype, arch) switch {
+					(Architecture.Arm64,    "aarch64")  => true,
+					(Architecture.X64,      "x86_64")   => true,
+					_ => false,
+				};
+			}
+			return true;
+		}
+
 		XATInfo[] GetJdkRoots ()
 		{
 			XATInfo jdk = null;