Remove go generate from the build process

cli.go

@@ -21,5 +21,3 @@
 //		app.Run(os.Args)
 //	}
 package cli
-
-//go:generate make -C cmd/urfave-cli-genflags run

docs/CONTRIBUTING.md

@@ -84,14 +84,13 @@ step.
 
 #### generated code
 
-A significant portion of the project's source code is generated, with the goal being to
+A significant portion of the project's source code is generated, to
 eliminate repetitive maintenance where other type-safe abstraction is impractical or
 impossible with Go versions `< 1.18`. In a future where the eldest Go version supported is
 `1.18.x`, there will likely be efforts to take advantage of
 [generics](https://go.dev/doc/tutorial/generics).
 
-The built-in `go generate` command is used to run the commands specified in
-`//go:generate` directives. Each such command runs a file that also supports a command
+Generator scripts also support command
 line help system which may be consulted for further information, e.g.:
 
 ```sh

internal/build/build.go

@@ -519,7 +519,7 @@
 	}
 
 	log.Println("--- generating Go source files ---")
-	return runCmd("go", "generate", cCtx.Path("top")+"/...")
+	return runCmd("make", "-C", cCtx.Path("top")+"/cmd/urfave-cli-genflags", "run")
 }
 
 func YAMLFmtActionFunc(cCtx *cli.Context) error {