cmTarget: Remove support for <CONFIG>_LOCATION property.

It is not documented, is very old, is compatibility code,
is non-uniform and is not needed.

Source/cmTarget.cxx

@@ -2722,25 +2722,6 @@ const char *cmTarget::GetProperty(const char* prop,
                                    this->GetLocation(configName.c_str()),
                                    cmProperty::TARGET);
       }
-    else
-      {
-      // Support "<CONFIG>_LOCATION" for compatibility.
-      int len = static_cast<int>(strlen(prop));
-      if(len > 9 && strcmp(prop+len-9, "_LOCATION") == 0)
-        {
-        std::string configName(prop, len-9);
-        if(configName != "IMPORTED")
-          {
-          if (!this->HandleLocationPropertyPolicy())
-            {
-            return 0;
-            }
-          this->Properties.SetProperty(prop,
-                                       this->GetLocation(configName.c_str()),
-                                       cmProperty::TARGET);
-          }
-        }
-      }
     }
   if(strcmp(prop,"INCLUDE_DIRECTORIES") == 0)
     {