kbuild: add -std=gnu89 to KBUILD_CFLAGS
Barebox imports lots of code from Linux, so should use the same
language standard as Linux.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
1 parent c10b20d commit b9c2b5c1b4bc6775613164f7b5a0dd583a8032f8
@Masahiro Yamada Masahiro Yamada authored on 18 May 2020
Sascha Hauer committed on 20 May 2020
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