fix linux build

Author: Geoff Kizer

src/System.Net.Http/src/Resources/Strings.resx

@@ -429,4 +429,28 @@
   <data name="net_http_authconnectionfailure" xml:space="preserve">
     <value>Authentication failed because the connection could not be reused.</value>
   </data>
+  <data name="net_nego_server_not_supported" xml:space="preserve">
+    <value>Server implementation is not supported</value>
+  </data>
+  <data name="net_nego_protection_level_not_supported" xml:space="preserve">
+    <value>Requested protection level is not supported with the gssapi implementation currently installed.</value>
+  </data>
+  <data name="net_context_buffer_too_small" xml:space="preserve">
+    <value>Insufficient buffer space. Required: {0} Actual: {1}.</value>
+  </data>
+  <data name="net_gssapi_operation_failed_detailed" xml:space="preserve">
+    <value>GSSAPI operation failed with error - {0} ({1}).</value>
+  </data>
+  <data name="net_gssapi_operation_failed" xml:space="preserve">
+    <value>GSSAPI operation failed with status: {0} (Minor status: {1}).</value>
+  </data>
+  <data name="net_nego_channel_binding_not_supported" xml:space="preserve">
+    <value>No support for channel binding on operating systems other than Windows.</value>
+  </data>
+  <data name="net_ntlm_not_possible_default_cred" xml:space="preserve">
+    <value>NTLM authentication is not possible with default credentials on this platform.</value>
+  </data>
+  <data name="net_nego_not_supported_empty_target_with_defaultcreds" xml:space="preserve">
+    <value>Target name should be non empty if default credentials are passed.</value>
+  </data>
 </root>

src/System.Net.Http/src/System.Net.Http.csproj

@@ -214,6 +214,12 @@
   <ItemGroup Condition=" '$(TargetsUnix)' == 'true' And '$(TargetGroup)' == 'netcoreapp'">
     <Compile Include="System\Net\Http\SocketsHttpHandler\SystemProxyInfo.Unix.cs" />
     <Compile Include="System\Net\Http\SocketsHttpHandler\HttpEnvironmentProxy.cs" />
+    <Compile Include="$(CommonPath)\System\Net\ContextAwareResult.Unix.cs">
+      <Link>Common\System\Net\ContextAwareResult.Unix.cs</Link>
+    </Compile>
+    <Compile Include="$(CommonPath)\System\Net\ContextFlagsAdapterPal.Unix.cs">
+      <Link>Common\System\Net\ContextFlagsAdapterPal.Unix.cs</Link>
+    </Compile>
     <Compile Include="$(CommonPath)\System\Net\Security\Unix\SafeFreeCredentials.cs">
       <Link>Common\System\Net\Security\Unix\SafeFreeCredentials.cs</Link>
     </Compile>
@@ -223,6 +229,24 @@
     <Compile Include="$(CommonPath)\System\Net\Security\NegotiateStreamPal.Unix.cs">
       <Link>Common\System\Net\Security\NegotiateStreamPal.Unix.cs</Link>
     </Compile>
+    <Compile Include="$(CommonPath)\Microsoft\Win32\SafeHandles\GssSafeHandles.cs">
+      <Link>Common\Microsoft\Win32\SafeHandles\GssSafeHandles.cs</Link>
+    </Compile>
+    <Compile Include="$(CommonPath)\Interop\Unix\System.Net.Security.Native\Interop.GssApiException.cs">
+      <Link>Common\Interop\Unix\System.Net.Security.Native\Interop.GssApiException.cs</Link>
+    </Compile>
+    <Compile Include="$(CommonPath)\System\Net\Security\Unix\SafeFreeNegoCredentials.cs">
+      <Link>Common\System\Net\Security\Unix\SafeFreeNegoCredentials.cs</Link>
+    </Compile>
+    <Compile Include="$(CommonPath)\Interop\Unix\System.Net.Security.Native\Interop.NetSecurityNative.cs">
+      <Link>Common\Interop\Unix\System.Net.Security.Native\Interop.NetSecurityNative.cs</Link>
+    </Compile>
+    <Compile Include="$(CommonPath)\Interop\Unix\System.Net.Security.Native\Interop.GssBuffer.cs">
+      <Link>Common\Interop\Unix\System.Net.Security.Native\Interop.GssBuffer.cs</Link>
+    </Compile>
+    <Compile Include="$(CommonPath)\System\Net\Security\Unix\SafeDeleteNegoContext.cs">
+      <Link>Common\System\Net\Security\Unix\SafeDeleteNegoContext.cs</Link>
+    </Compile>
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetsWindows)' == 'true' And '$(TargetGroup)' == 'netcoreapp'">
     <Compile Include="System\Net\Http\SocketsHttpHandler\SystemProxyInfo.Windows.cs" />