Source: Convince LCC that RAII variables are used

Extend the change from commit 5ad8862318 (Source: Convince NVHPC that
RAII variables are used, 2021-04-26, v3.21.0-rc1~254^2~1) to apply to
LCC too.

Source/cmLoadCommandCommand.cxx

@@ -91,7 +91,7 @@ struct LoadedCommandImpl : cmLoadedCommandInfo
   {
     if (this->Destructor) {
       SignalHandlerGuard guard(this->Name);
-#if defined(__NVCOMPILER)
+#if defined(__NVCOMPILER) || defined(__LCC__)
       static_cast<void>(guard); // convince compiler var is used
 #endif
       this->Destructor(this);
@@ -107,7 +107,7 @@ struct LoadedCommandImpl : cmLoadedCommandInfo
   int DoInitialPass(cmMakefile* mf, int argc, char* argv[])
   {
     SignalHandlerGuard guard(this->Name);
-#if defined(__NVCOMPILER)
+#if defined(__NVCOMPILER) || defined(__LCC__)
     static_cast<void>(guard); // convince compiler var is used
 #endif
     return this->InitialPass(this, mf, argc, argv);
@@ -116,7 +116,7 @@ struct LoadedCommandImpl : cmLoadedCommandInfo
   void DoFinalPass(cmMakefile* mf)
   {
     SignalHandlerGuard guard(this->Name);
-#if defined(__NVCOMPILER)
+#if defined(__NVCOMPILER) || defined(__LCC__)
     static_cast<void>(guard); // convince compiler var is used
 #endif
     this->FinalPass(this, mf);

Source/cmQtAutoMocUic.cxx

@@ -2789,7 +2789,7 @@ void cmQtAutoMocUicT::CreateParseJobs(SourceFileMapT const& sourceMap)
 std::string cmQtAutoMocUicT::CollapseFullPathTS(std::string const& path) const
 {
   std::lock_guard<std::mutex> guard(this->CMakeLibMutex_);
-#if defined(__NVCOMPILER)
+#if defined(__NVCOMPILER) || defined(__LCC__)
   static_cast<void>(guard); // convince compiler var is used
 #endif
   return cmSystemTools::CollapseFullPath(path,
@@ -3031,7 +3031,7 @@ std::vector<std::string> cmQtAutoMocUicT::dependenciesFromDepFile(
   const char* filePath)
 {
   std::lock_guard<std::mutex> guard(this->CMakeLibMutex_);
-#if defined(__NVCOMPILER)
+#if defined(__NVCOMPILER) || defined(__LCC__)
   static_cast<void>(guard); // convince compiler var is used
 #endif
   auto const content = cmReadGccDepfile(filePath);