COMPMID-1313: Tried to remove -Wno-implicit-fallthrough as it doesn't seem to be supported by recent compilers

Change-Id: I4c48856e482741420df2696d918e901477e94d74
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/138198
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/SConstruct b/SConstruct
index 23b9b2f..b393a7e 100644
--- a/SConstruct
+++ b/SConstruct
@@ -91,7 +91,7 @@
          '-Wextra','-Wno-unused-parameter','-pedantic','-Wdisabled-optimization','-Wformat=2',
          '-Winit-self','-Wstrict-overflow=2','-Wswitch-default',
          '-fpermissive','-std=gnu++11','-Wno-vla','-Woverloaded-virtual',
-         '-Wctor-dtor-privacy','-Wsign-promo','-Weffc++','-Wno-format-nonliteral','-Wno-overlength-strings','-Wno-strict-overflow','-Wno-implicit-fallthrough'])
+         '-Wctor-dtor-privacy','-Wsign-promo','-Weffc++','-Wno-format-nonliteral','-Wno-overlength-strings','-Wno-strict-overflow'])
 
 env.Append(CPPDEFINES = ['_GLIBCXX_USE_NANOSLEEP'])