ENH: Fixed INSTALL_FILES and INSTALL_PROGRAMS commands to not create targets. No targets of type cmTarget::INSTALL_FILES or cmTarget::INSTALL_PROGRAMS are created, so we do not need to check for them everywhere anymore.

Source/cmInstallProgramsCommand.h

@@ -101,8 +101,9 @@ public:
 protected:
   std::string FindInstallSource(const char* name) const;
 private:
-  std::string TargetName;
   std::vector<std::string> FinalArgs;
+  std::string Destination;
+  std::vector<std::string> Files;
 };