Makefiles: Remove duplicate code.

The cmGlobalUnixMakefileGenerator3::ProgressMapCompare struct is
logically equivalent to cmStrictTargetComparison.

Source/cmGlobalUnixMakefileGenerator3.cxx

@@ -957,21 +957,6 @@ cmGlobalUnixMakefileGenerator3::RecordTargetProgress(
   tp.VariableFile = tg->GetProgressFileNameFull();
 }
 
-//----------------------------------------------------------------------------
-bool
-cmGlobalUnixMakefileGenerator3::ProgressMapCompare
-::operator()(cmTarget const* l, cmTarget const* r) const
-{
-  // Order by target name.
-  if(int c = strcmp(l->GetName().c_str(), r->GetName().c_str()))
-    {
-    return c < 0;
-    }
-  // Order duplicate targets by binary directory.
-  return strcmp(l->GetMakefile()->GetCurrentOutputDirectory(),
-                r->GetMakefile()->GetCurrentOutputDirectory()) < 0;
-}
-
 //----------------------------------------------------------------------------
 void
 cmGlobalUnixMakefileGenerator3::TargetProgress

Source/cmGlobalUnixMakefileGenerator3.h

@@ -185,10 +185,8 @@ protected:
     std::vector<unsigned long> Marks;
     void WriteProgressVariables(unsigned long total, unsigned long& current);
   };
-  struct ProgressMapCompare { bool operator()(cmTarget const*,
-                                              cmTarget const*) const; };
   typedef std::map<cmTarget const*, TargetProgress,
-                   ProgressMapCompare> ProgressMapType;
+                   cmStrictTargetComparison> ProgressMapType;
   ProgressMapType ProgressMap;
 
   size_t CountProgressMarksInTarget(cmTarget const* target,