COMPMID-1246: Add -Wno-implicit-fallthrough flag on gcc compilation

Change-Id: I419ea7c97aa3a85bd13e5c124c4d89eb07321e73
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/138456
Reviewed-by: Vidhya Sudhan Loganathan <vidhyasudhan.loganathan@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
1 file changed