add unix_sockets_posix module to build system and fix compilation errors
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
index 1f24021..b7cf076 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
@@ -214,6 +214,12 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\iomgr\udp_server.c">
       <Filter>src\core\iomgr</Filter>
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\iomgr\unix_sockets_posix.c">
+      <Filter>src\core\iomgr</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\iomgr\unix_sockets_posix_noop.c">
+      <Filter>src\core\iomgr</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\iomgr\wakeup_fd_eventfd.c">
       <Filter>src\core\iomgr</Filter>
     </ClCompile>
@@ -659,6 +665,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\iomgr\udp_server.h">
       <Filter>src\core\iomgr</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\iomgr\unix_sockets_posix.h">
+      <Filter>src\core\iomgr</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\iomgr\wakeup_fd_pipe.h">
       <Filter>src\core\iomgr</Filter>
     </ClInclude>