Enable control flow guard for IIS dlls (#22608)

Author: jkotalik

src/Servers/IIS/build/Build.Settings

@@ -25,6 +25,7 @@
        <PrecompiledHeader>Use</PrecompiledHeader>
        <TreatWarningAsError Condition="'$(TreatWarningsAsErrors)' != ''">true</TreatWarningAsError>
        <SDLCheck>true</SDLCheck>
+       <ControlFlowGuard>Guard</ControlFlowGuard>
        <StringPooling>true</StringPooling>
      </ClCompile>
      <Link>
@@ -88,4 +89,4 @@
     <AssemblyBuild>$(_TwoDigitYear)$(_ThreeDigitDayOfYear)</AssemblyBuild>
   </PropertyGroup>
 
- </Project>
+ </Project>