Makefile: Disable gcc-10.0 introduced warnings

Follow what the Linux Kernel does here and disable the
'zero-length-bounds', 'array-bounds' and 'stringop-overflow' warnings
here.

This brings in commits 5c45de21a2223, 44720996e2d79 and 5a76021c2eff7
from the Linux Kernel.
Signed-off-by: NTom Rini <trini@konsulko.com>

Makefile

@@ -712,6 +712,10 @@ KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks)
 # disable stringop warnings in gcc 8+
 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 
+KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
+KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
+KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
+
 # Enabled with W=2, disabled by default as noisy
 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)