ENH: fix warnings

Source/cmIfCommand.cxx

@@ -141,7 +141,7 @@ IsFunctionBlocked(const cmListFileFunction& lff, cmMakefile &mf,
 }
 
 bool cmIfFunctionBlocker::ShouldRemove(const cmListFileFunction& lff,
-                                       cmMakefile& mf)
+                                       cmMakefile&)
 {
   if (!cmSystemTools::Strucmp(lff.Name.c_str(),"endif"))
     {

Source/cmWhileCommand.cxx

@@ -89,7 +89,7 @@ IsFunctionBlocked(const cmListFileFunction& lff, cmMakefile &mf,
 }
 
 bool cmWhileFunctionBlocker::
-ShouldRemove(const cmListFileFunction& lff, cmMakefile& mf)
+ShouldRemove(const cmListFileFunction& lff, cmMakefile& )
 {
   if(!cmSystemTools::Strucmp(lff.Name.c_str(),"endwhile"))
     {