Remove some c_str() calls.

Use the clang RemoveCStrCalls tool to automatically migrate the
code. This was only run on linux, so does not have any positive or
negative effect on other platforms.

Source/cmMacroCommand.cxx

@@ -95,7 +95,7 @@ bool cmMacroHelperCommand::InvokeInitialPass
     std::string errorMsg =
       "Macro invoked with incorrect arguments for macro named: ";
     errorMsg += this->Args[0];
-    this->SetError(errorMsg.c_str());
+    this->SetError(errorMsg);
     return false;
     }
 
@@ -276,8 +276,8 @@ IsFunctionBlocked(const cmListFileFunction& lff, cmMakefile &mf,
       f->Functions = this->Functions;
       mf.RecordPolicies(f->Policies);
       std::string newName = "_" + this->Args[0];
-      mf.GetCMakeInstance()->RenameCommand(this->Args[0].c_str(),
-                                           newName.c_str());
+      mf.GetCMakeInstance()->RenameCommand(this->Args[0],
+                                           newName);
       mf.AddCommand(f);
 
       // remove the function blocker now that the macro is defined