Ninja: Add 'restat' parameter to custom command generation method

Pass 'true' from all call sites to preserve existing behavior.

Source/cmGlobalNinjaGenerator.cxx

@@ -284,6 +284,7 @@ cmGlobalNinjaGenerator::WriteCustomCommandBuild(const std::string& command,
                                                 const std::string& description,
                                                 const std::string& comment,
                                                 bool uses_terminal,
+                                                bool restat,
                                                 const cmNinjaDeps& outputs,
                                                 const cmNinjaDeps& deps,
                                                 const cmNinjaDeps& orderOnly)
@@ -300,7 +301,10 @@ cmGlobalNinjaGenerator::WriteCustomCommandBuild(const std::string& command,
   cmNinjaVars vars;
   vars["COMMAND"] = cmd;
   vars["DESC"] = EncodeLiteral(description);
+  if (restat)
+    {
     vars["restat"] = "1";
+    }
   if (uses_terminal && SupportsConsolePool())
     {
     vars["pool"] = "console";
@@ -924,6 +928,7 @@ void cmGlobalNinjaGenerator::WriteAssumedSourceDependencies()
     WriteCustomCommandBuild(/*command=*/"", /*description=*/"",
                             "Assume dependencies for generated source file.",
                             /*uses_terminal*/false,
+                            /*restat*/true,
                             cmNinjaDeps(1, i->first), deps);
   }
 }

Source/cmGlobalNinjaGenerator.h

@@ -112,6 +112,7 @@ public:
                                const std::string& description,
                                const std::string& comment,
                                bool uses_terminal,
+                               bool restat,
                                const cmNinjaDeps& outputs,
                                const cmNinjaDeps& deps = cmNinjaDeps(),
                                const cmNinjaDeps& orderOnly = cmNinjaDeps());

Source/cmLocalNinjaGenerator.cxx

@@ -434,6 +434,7 @@ cmLocalNinjaGenerator::WriteCustomCommandBuildStatement(
       this->ConstructComment(ccg),
       "Custom command for " + ninjaOutputs[0],
       cc->GetUsesTerminal(),
+      /*restat*/true,
       ninjaOutputs,
       ninjaDeps,
       orderOnlyDeps);

Source/cmNinjaUtilityTargetGenerator.cxx

@@ -131,6 +131,7 @@ void cmNinjaUtilityTargetGenerator::Generate()
       desc,
       "Utility command for " + this->GetTargetName(),
       uses_terminal,
+      /*restat*/true,
       util_outputs,
       deps);