Enable native AOT for non-portable crossgen2

- Add a breadcrumb for non-portable build into the Native AOT runtime pack
- Use the breadcrumb to add system OpenSSL libs to the linker command
  line

Contributes to dotnet#66859

src/coreclr/nativeaot/BuildIntegration/BuildIntegration.proj

@@ -16,6 +16,11 @@
  <WriteLinesToFile
  File="$(RuntimeBinDir)/aotsdk/debugucrt.txt"
  Condition="'$(TargetsWindows)'=='true' and '$(Configuration)' != 'Release'" />
+
+ <!-- Create breadcrumb to add additional libraries for non-portable builds -->
+ <WriteLinesToFile
+ File="$(RuntimeBinDir)/aotsdk/nonportable.txt"
+ Condition="'$(TargetsWindows)'!='true' and '$(PortableBuild)' != 'true'" />
  </Target>
 
  <Target Name="Restore" />

src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets

@@ -142,6 +142,11 @@ The .NET Foundation licenses this file to you under the MIT license.
  <StaticICULibs Include="-Wl,-Bdynamic" Condition="'$(StaticExecutable)' != 'true'" />
  </ItemGroup>
 
+ <ItemGroup Condition="'$(StaticOpenSslLinking)' != 'true' and Exists('$(IlcSdkPath)nonportable.txt')">
+ <NativeSystemLibrary Include="ssl" />
+ <NativeSystemLibrary Include="crypto" />
+ </ItemGroup>
+
  <ItemGroup Condition="'$(StaticOpenSslLinking)' == 'true' and '$(NativeLib)' != 'Static'">
  <NativeLibrary Include="$(IntermediateOutputPath)libs/System.Security.Cryptography.Native/build/libSystem.Security.Cryptography.Native.OpenSsl.a" />
  <DirectPInvoke Include="libSystem.Security.Cryptography.Native.OpenSsl" />

src/coreclr/tools/aot/crossgen2/crossgen2_publish.csproj

@@ -7,8 +7,6 @@
  <Import Project="Sdk.props" Sdk="Microsoft.NET.Sdk" />
 
  <PropertyGroup>
- <!-- Can't use NativeAOT in non-portable build yet https://github.com/dotnet/runtime/issues/66859 -->
- <NativeAotSupported Condition="'$(PortableBuild)' != 'true'">false</NativeAotSupported>
  <NativeAotSupported Condition="$(OutputRID.StartsWith('tizen')) == 'true'">false</NativeAotSupported>
  <NativeAotSupported Condition="$(OutputRID.EndsWith('-arm')) == 'true'">false</NativeAotSupported>
  <!-- Publish crossgen2 as a single-file app on native-OS builds. Cross-OS NativeAOT compilation is not supported yet -->

src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Crossgen2.sfxproj

@@ -20,8 +20,6 @@
  <ShouldVerifyClosure>false</ShouldVerifyClosure>
  <!-- Publish crossgen2 as a single-file app on native-OS builds. Cross-OS NativeAOT compilation is not supported yet -->
  <NativeAotSupported Condition="'$(CrossBuild)' == 'true' and '$(TargetOS)' != '$(HostOS)'">false</NativeAotSupported>
- <!-- Can't use NativeAOT in source build yet https://github.com/dotnet/runtime/issues/66859 -->
- <NativeAotSupported Condition="'$(DotNetBuildFromSource)' == 'true'">false</NativeAotSupported>
  </PropertyGroup>
 
  <ItemGroup>