make: Added -fno-strict-overflow to makefile
make: Added -fno-strict-overflow to makefile

modified CFLAGS to avoid gcc optimising the signed integer overflow checks.

CRs-Fixed: 691916.
Change-Id: I9c01609eaa486351f79289e4df803b9281c65dff

Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,efidroid/lk,efidroid/lk,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,efidroid/lk,CanarySolutions/little-kernel,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel