Fix missing System.Memory dependency from Registry

Since Registry only targeted netcoreapp2.0 for Unix, only the Unix-specific dependencies
were listed in the netcoreapp2.0 dependency group.  This was a problem since the windows
netstandard impl required System.Memory but the unix netcoreapp2.0 impl did not.

As a result netcoreapp2.0 was missing the System.Memory dependency.

Author: ericstj

src/Microsoft.Win32.Registry/src/Configurations.props

@@ -3,8 +3,8 @@
   <PropertyGroup>
     <PackageConfigurations>
       netstandard-Windows_NT;
+      netstandard-Unix;
       netstandard;
-      netcoreapp2.0-Unix;
       netfx-Windows_NT;
     </PackageConfigurations>
     <BuildConfigurations>

src/Microsoft.Win32.Registry/src/Microsoft.Win32.Registry.csproj

@@ -8,7 +8,7 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <DefineConstants>$(DefineConstants);REGISTRY_ASSEMBLY</DefineConstants>
     <IsPartialFacadeAssembly Condition="'$(TargetGroup)' == 'netfx'">true</IsPartialFacadeAssembly>
-    <GeneratePlatformNotSupportedAssemblyMessage Condition="'$(TargetsWindows)' != 'true' AND '$(TargetGroup)' == 'netstandard'">SR.PlatformNotSupported_Registry</GeneratePlatformNotSupportedAssemblyMessage>
+    <GeneratePlatformNotSupportedAssemblyMessage Condition="'$(OSGroup)' == 'AnyOS' AND '$(TargetGroup)' == 'netstandard'">SR.PlatformNotSupported_Registry</GeneratePlatformNotSupportedAssemblyMessage>
     <!-- 
         Temporarily necessary as this is only being built for UWP due to an unwanted dependency on it 
         https://github.com/dotnet/corefx/issues/15966
@@ -19,15 +19,15 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netcoreapp-Unix-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netcoreapp-Windows_NT-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netcoreapp-Windows_NT-Release|AnyCPU'" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netcoreapp2.0-Unix-Debug|AnyCPU'" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netcoreapp2.0-Unix-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netfx-Windows_NT-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netfx-Windows_NT-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netstandard-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netstandard-Release|AnyCPU'" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netstandard-Unix-Debug|AnyCPU'" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netstandard-Unix-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netstandard-Windows_NT-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'netstandard-Windows_NT-Release|AnyCPU'" />
-  <ItemGroup Condition="$(TargetGroup.StartsWith('netcoreapp')) OR ('$(TargetGroup)' == 'netstandard' AND '$(TargetsWindows)' == 'true')">
+  <ItemGroup Condition="'$(TargetGroup)' != 'netfx' AND '$(OSGroup)' != 'AnyOS'">
     <Compile Include="$(CommonPath)\Interop\Windows\advapi32\Interop.RegistryOptions.cs">
       <Link>Common\Interop\Windows\Interop.RegistryOptions.cs</Link>
     </Compile>
@@ -44,7 +44,7 @@
     <Compile Include="System\Security\AccessControl\RegistryRights.cs" />
     <Compile Include="System\Security\AccessControl\RegistrySecurity.cs" />
   </ItemGroup>
-  <ItemGroup Condition="($(TargetGroup.StartsWith('netcoreapp')) OR '$(TargetGroup)' == 'netstandard') AND '$(TargetsWindows)' == 'true'">
+  <ItemGroup Condition="'$(TargetGroup)' != 'netfx' AND '$(TargetsWindows)' == 'true'">
     <Compile Include="$(CommonPath)\Interop\Windows\Interop.Libraries.cs">
       <Link>Common\Interop\Windows\Interop.Libraries.cs</Link>
     </Compile>