Added VS2013 project for dictBuilder

- fixed strings.h vs string.h include
- fixed INLINE/FORCE_INLINE defines

visual/2013/zstdlib/zstdlib.vcxproj

@@ -27,6 +27,8 @@
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\lib\bitstream.h" />
+    <ClInclude Include="..\..\..\lib\error_private.h" />
+    <ClInclude Include="..\..\..\lib\error_public.h" />
     <ClInclude Include="..\..\..\lib\fse.h" />
     <ClInclude Include="..\..\..\lib\fse_static.h" />
     <ClInclude Include="..\..\..\lib\huff0.h" />