fix compiling/running tests on win32

- new files
- different warning settings
- all tests run in a single process (no fork)

contrib/ports/win32/msvc/lwip_unittests.vcxproj

@@ -84,6 +84,7 @@
     <ClCompile Include="..\..\..\..\test\unit\api\test_sockets.c" />
     <ClCompile Include="..\..\..\..\test\unit\arch\sys_arch.c" />
     <ClCompile Include="..\..\..\..\test\unit\core\test_def.c" />
+    <ClCompile Include="..\..\..\..\test\unit\core\test_dns.c" />
     <ClCompile Include="..\..\..\..\test\unit\core\test_mem.c" />
     <ClCompile Include="..\..\..\..\test\unit\core\test_netif.c" />
     <ClCompile Include="..\..\..\..\test\unit\core\test_pbuf.c" />
@@ -104,6 +105,7 @@
     <ClInclude Include="..\..\..\..\test\unit\api\test_sockets.h" />
     <ClInclude Include="..\..\..\..\test\unit\arch\sys_arch.h" />
     <ClInclude Include="..\..\..\..\test\unit\core\test_def.h" />
+    <ClInclude Include="..\..\..\..\test\unit\core\test_dns.h" />
     <ClInclude Include="..\..\..\..\test\unit\core\test_mem.h" />
     <ClInclude Include="..\..\..\..\test\unit\core\test_netif.h" />
     <ClInclude Include="..\..\..\..\test\unit\core\test_pbuf.h" />

contrib/ports/win32/msvc/lwip_unittests.vcxproj.filters

@@ -88,6 +88,9 @@
     <ClCompile Include="..\..\..\..\test\unit\ip6\test_ip6.c">
       <Filter>ipv6</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\test\unit\core\test_dns.c">
+      <Filter>core</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\..\test\unit\core\test_mem.h">
@@ -143,5 +146,8 @@
     <ClInclude Include="..\..\..\..\test\unit\ip6\test_ip6.h">
       <Filter>ipv6</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\test\unit\core\test_dns.h">
+      <Filter>core</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>