Ignore "ambiguous variable name" warning for EasyConfig style check

[Flamefire]

'l' is considered an ambiguous name, but we use it often for 'lib'

Required for easybuilders/easybuild-easyconfigs#21405

[boegel]

@Flamefire I actually think it would be better if we stopped using l as single-letter variable in easyconfig, so rather than ignoring it, we should fix it?

[Flamefire]

I wouldn't mind. It should be a "quick" search and replace. I see at least 104 affected easyconfigs. Additionally what should l for l in (lib, lib64) become? We'd need to use local_lib which is a bit verbose. Or i