Add platform_utils and zeroize to visualc files
diff --git a/visualc/VS2010/mbedTLS.vcxproj b/visualc/VS2010/mbedTLS.vcxproj
index f13f83c..802cce7 100644
--- a/visualc/VS2010/mbedTLS.vcxproj
+++ b/visualc/VS2010/mbedTLS.vcxproj
@@ -197,6 +197,7 @@
     <ClInclude Include="..\..\include\mbedtls\pkcs5.h" />

     <ClInclude Include="..\..\include\mbedtls\platform.h" />

     <ClInclude Include="..\..\include\mbedtls\platform_time.h" />

+    <ClInclude Include="..\..\include\mbedtls\platform_util.h" />

     <ClInclude Include="..\..\include\mbedtls\ripemd160.h" />

     <ClInclude Include="..\..\include\mbedtls\rsa.h" />

     <ClInclude Include="..\..\include\mbedtls\rsa_internal.h" />

@@ -266,6 +267,7 @@
     <ClCompile Include="..\..\library\pkparse.c" />

     <ClCompile Include="..\..\library\pkwrite.c" />

     <ClCompile Include="..\..\library\platform.c" />

+    <ClCompile Include="..\..\library\platform_util.c" />

     <ClCompile Include="..\..\library\ripemd160.c" />

     <ClCompile Include="..\..\library\rsa.c" />

     <ClCompile Include="..\..\library\rsa_internal.c" />