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Subjectx86/purgatory: undefined symbol __stack_chk_fail

For me, kernels built including this commit
b059f801a937 (x86/purgatory: Use CFLAGS_REMOVE rather than reset KBUILD_CFLAGS)

results in kexec() failing to load the kernel:

kexec: Undefined symbol: __stack_chk_fail
kexec-bzImage64: Loading purgatory failed

Can be seen:

$ readelf -a arch/x86/purgatory/ | grep UND
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
51: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __stack_chk_fail

Using: gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)

Adding -ffreestanding or -fno-stack-protector to ccflags-y in
fixes the problem. Not sure which would be preferred.

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