windows: include new sourcecode files

ref: https://github.com/espeak-ng/espeak-ng/issues/857#issuecomment-962500311

src/windows/libespeak-ng.vcxproj

@@ -158,6 +158,7 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="..\libespeak-ng\soundicon.c" />
     <ClCompile Include="..\ucd-tools\src\case.c" />
     <ClCompile Include="..\ucd-tools\src\categories.c" />
     <ClCompile Include="..\ucd-tools\src\ctype.c" />
@@ -209,6 +210,7 @@
     <ClInclude Include="..\libespeak-ng\mbrowrap.h" />
     <ClInclude Include="..\libespeak-ng\phoneme.h" />
     <ClInclude Include="..\libespeak-ng\sintab.h" />
+    <ClInclude Include="..\libespeak-ng\soundicon.h" />
     <ClInclude Include="..\libespeak-ng\spect.h" />
     <ClInclude Include="..\libespeak-ng\speech.h" />
     <ClInclude Include="..\libespeak-ng\sPlayer.h" />

src/windows/libespeak-ng.vcxproj.filters

@@ -135,6 +135,24 @@
     <ClCompile Include="..\libespeak-ng\phoneme.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\libespeak-ng\sPlayer.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\libespeak-ng\ssml.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\speechPlayer\src\frame.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\speechPlayer\src\speechPlayer.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\speechPlayer\src\speechWaveGenerator.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\libespeak-ng\soundicon.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="config.h">
@@ -185,6 +203,12 @@
     <ClInclude Include="..\include\ucd-tools\src\include\ucd\ucd.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\libespeak-ng\sPlayer.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\libespeak-ng\soundicon.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="libespeak-ng.def">