package/sg3_utils: fix build failure due to gcc bug 104028

The sg3_utils package exhibits gcc bug 104028 when built for the M68K
architecture with optimization enabled, which causes a build failure.

As done for other packages in Buildroot work around this gcc bug by
setting optimization to -O0 if BR2_TOOLCHAIN_HAS_GCC_BUG_104028=y like we
already do for BR2_TOOLCHAIN_HAS_GCC_BUG_85180=y.

Fixes:
http://autobuild.buildroot.net/results/c49300d12a209b18f41d389f092324592b881277/



Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>