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main/s390-tools: disable _FORTIFY_SOURCE in zipl

Natanael Copa requested to merge ncopa/aports:3.16-stable-s390-tools into 3.16-stable

Disabling _FORTIFY_SOURCE fixes SIGFPE in zipl:

Program received signal SIGFPE, Arithmetic exception. memcpy (__n=7976, __os=, __od=0x3fffdff60c0) at /usr/include/fortify/string.h:53 53 return __builtin_memcpy(__od, __os, __n);

disassebly shows that the exception happens on the jump instruction to memcpy. Work around it by disabling _FORTIFY_SOURCE for zipl.

(cherry picked from commit 9fa93539)

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