BUG: Fix color check for dependency scanning

Generation of color rules for dependency scanning messages did not
account for disabling color at generation time.  See issue #7814.

Source/cmLocalUnixMakefileGenerator3.h

@@ -193,6 +193,9 @@ public:
   void AppendEcho(std::vector<std::string>& commands, const char* text,
                   EchoColor color = EchoNormal);
 
+  /** Get whether the makefile is to have color.  */
+  bool GetColorMakefile() const { return this->ColorMakefile; }
+
   virtual std::string GetTargetDirectory(cmTarget const& target) const;
 
     // create a command that cds to the start dir then runs the commands