kbuild: -fno-stack-protector is not good

Ubuntu gcc has hardcoded -fstack-protector - but does not understand
-fno-stack-protector-all. So only try -fno-stack-protector.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Makefile

@@ -310,8 +310,8 @@ CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
                    -fno-strict-aliasing -fno-common
 # Force gcc to behave correct even for buggy distributions
-CFLAGS          += $(call cc-option, -fno-stack-protector-all \
-                                     -fno-stack-protector)
+CFLAGS          += $(call cc-option, -fno-stack-protector)
+
 AFLAGS          := -D__ASSEMBLY__
 
 # Read KERNELRELEASE from include/config/kernel.release (if it exists)