linux4.9: patch Makefile to add -Wno-error
linux4.9: patch Makefile to add -Wno-error

Try to work around the gcc-9.1.0 warning on armv7l*

Signed-off-by: Jürgen Buchmüller <2642204b262fe30d9fcde46ee57f8ed7ac19ed92@t-online.de>

necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages