Any program that links with conio_sdl needs winmm.lib too

For waveOutOpen and friend functions

src/conio/conio_sdl.props

@@ -10,6 +10,9 @@
       <PreprocessorDefinitions>WITH_GDI;WITH_SDL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(MSBuildThisFileDirectory);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
+    <Link>
+      <AdditionalDependencies>winmm.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
   </ItemDefinitionGroup>
   <ItemGroup />
 </Project>
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