Merging //UE4/Dev-Main to Dev-VR (//UE4/Dev-VR)

#rb integration
#lockdown Nick.Whiting
#CodeReview: ryan.vance

[CL 6895021 by Jason Bestimt in Dev-VR branch]

Engine/Plugins/Experimental/PythonScriptPlugin/Source/PythonScriptPluginPreload/PythonScriptPluginPreload.Build.cs

@@ -13,11 +13,18 @@ namespace UnrealBuildTool.Rules
 				}
 			);
 
-			PrivateIncludePathModuleNames.AddRange(
-				new string[] {
-					"Python",
-				}
-			);
+			if (Target.bBuildEditor)
+			{
+				PrivateIncludePathModuleNames.AddRange(
+					new string[] {
+						"Python",
+					}
+				);
+			}
+			else
+			{
+				PrivateDefinitions.Add("WITH_PYTHON=0");
+			}
 		}
 	}
 }