Update VS import props.

Author: evoskuil

builds/msvc/vs2013/libbitcoin.import.props

@@ -20,7 +20,7 @@
       <DisableSpecificWarnings>4996;%(DisableSpecificWarnings)</DisableSpecificWarnings>
       <!-- NOMINMAX enables use of std::min/max without conflict. -->
       <!-- WIN32_LEAN_AND_MEAN avoids boost conflict: lists.boost.org/boost-users/2008/07/37824.php. -->
-      <PreprocessorDefinitions>WIN32_LEAN_AND_MEAN;NOMINMAX;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WITH_ICU;WIN32_LEAN_AND_MEAN;NOMINMAX;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Option-testnet)' == 'true'">ENABLE_TESTNET;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Linkage-libbitcoin)' == 'static' Or '$(Linkage-libbitcoin)' == 'ltcg'">BC_STATIC;%(PreprocessorDefinitions)</PreprocessorDefinitions>      
     </ClCompile>