test: self: printf: compile test with -Wno-format-security

For testing purposes, the test code uses a variable for the format
string at places, which -Wformat-security doesn't like.

The printf test was copied over from the kernel, which sets
-Wno-format-security globally. This may not be needed for barebox yet,
but let's set at least for this one file.

Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Link: https://lore.barebox.org/20230424115548.114858-1-ahmad@a3f.at
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

0 files changed, 0 insertions, 0 deletions