Update ICU to 54.1 step 1

source/tools/genrb/genrb.vcxproj

 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
     <ProjectConfiguration Include="Debug|x64">
       <Configuration>Debug</Configuration>
       <Platform>x64</Platform>
@@ skipping 222 matching lines @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <ProgramDatabaseFile>.\x64\Debug/genrb.pdb</ProgramDatabaseFile>
       <SubSystem>Console</SubSystem>
       <TargetMachine>MachineX64</TargetMachine>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="errmsg.c" />
     <ClCompile Include="genrb.c" />
-    <ClCompile Include="parse.cpp" />
+    <ClCompile Include="parse.cpp">
+      <DisableLanguageExtensions>false</DisableLanguageExtensions>
+    </ClCompile>
     <ClCompile Include="prscmnts.cpp" />
     <ClCompile Include="rbutil.c" />
     <ClCompile Include="read.c" />
     <ClCompile Include="reslist.c" />
     <ClCompile Include="rle.c" />
     <ClCompile Include="ustr.c" />
     <ClCompile Include="wrtjava.c" />
     <ClCompile Include="wrtxml.cpp" />
   </ItemGroup>
   <ItemGroup>
@@ skipping 17 matching lines @@
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
     </ProjectReference>
     <ProjectReference Include="..\toolutil\toolutil.vcxproj">
       <Project>{6b231032-3cb5-4eed-9210-810d666a23a0}</Project>
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
     </ProjectReference>
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>