Revert "load_command: Deprecate and document pending removal"

This reverts commit d2d43986e7.
We will add a policy to remove the command more gracefully.

Source/cmLoadCommandCommand.cxx

@@ -224,10 +224,6 @@ cmLoadedCommand::~cmLoadedCommand()
 bool cmLoadCommandCommand
 ::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
 {
-  this->Makefile->IssueMessage(
-    cmake::AUTHOR_WARNING,
-    "The \"load_command\" command will be removed in CMake 3.0.  "
-    "See command documentation for details.");
   if(args.size() < 1 )
     {
     return true;