selftests: gpio: restore CFLAGS options
All the CFLAGS options were incorrectly removed in the recent rework of the GPIO selftests. While some of the flags were specific to the old implementation the remainder are still relevant. Restore those options. Signed-off-by: Kent Gibson <warthog618@gmail.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
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