Change in coreboot[master]: tests: Disable -Wmain-return-type for clang

[Julius Werner (Code Review)]

Hello build bot (Jenkins), Jakub Czapiga,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/59815

to look at the new patch set (#3).

Change subject: tests: Disable -Wmain-return-type for clang
......................................................................

tests: Disable -Wmain-return-type for clang

Unit tests fail on clang 13.0 because Cmocka's main() function is
declared with return type int, but through some of our chain-include
games it sometimes gets coreboot's main_decl.h which declares the
function as void. Compilers have traditionally always been very
laissez-faire about the signature of the main function, but it seems
that clang has been getting more strict by default recently. Explicitly
disable the related warning to shut it up.

Signed-off-by: Julius Werner 
Change-Id: I867c9dac659be86e7b7cf4cc41d6fa105aa9ac41
---
M payloads/libpayload/tests/Makefile.inc
M tests/Makefile.inc
2 files changed, 2 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/15/59815/3