Remove MAKEFLAGS=--warn-undefined-variables

This is not generally required, and could manually be added as command
line argumen when needed e.g. to debug a Makefile.

> `--warn-undefined-variables'
>
> Issue a warning message whenever make sees a reference to an undefined
> variable. This can be helpful when you are trying to debug makefiles
> which use variables in complex ways.

Author: stanislav-zaprudskiy

Makefile

@@ -6,7 +6,6 @@
 # SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company
 # SPDX-License-Identifier: Apache-2.0
 
-MAKEFLAGS=--warn-undefined-variables
 # /bin/sh is dash on Debian which does not support all features of ash/bash
 # to fix that we use /bin/bash only on Debian to not break Alpine
 ifneq (,$(wildcard /etc/os-release)) # check file existence

internal/makefile/makefile.go

@@ -46,7 +46,6 @@ func newMakefile(cfg core.Configuration, sr golang.ScanResult) *makefile {
 	// General
 	general := category{name: "general"}
 
-	general.addDefinition("MAKEFLAGS=--warn-undefined-variables")
 	general.addDefinition(strings.TrimSpace(`
 # /bin/sh is dash on Debian which does not support all features of ash/bash
 # to fix that we use /bin/bash only on Debian to not break Alpine