Make MSVC compiler read the source code using utf-8

build_msvc/common.vcxproj

@@ -12,4 +12,9 @@
           Outputs="$(MSBuildThisFileDirectory)..\src\config\bitcoin-config.h">
       <Copy SourceFiles="$(MSBuildThisFileDirectory)bitcoin_config.h" DestinationFiles="$(MSBuildThisFileDirectory)..\src\config\bitcoin-config.h" />
   </Target>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
+    </ClCompile>
+  </ItemDefinitionGroup>
 </Project>