build: make sure OpenSSL heeds noexecstack
build: make sure OpenSSL heeds noexecstack

This passes `-Wa,--noexecstack` to the assembler when building
platform-specific assembly files, to signal that a non-executable stack
can be used. This is the same approach as used by Debian
(see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=430583)

Rebased-From: bfcdc21a5da25ec1aa4aecc4cd8960dfa1c11781
Github-Pull: #6852

my-first/octocoin,genavarov/ladacoin,octocoin-project/octocoin,genavarov/lamacoin,capitalDIGI/DIGI-v-0-10-4,pascalguru/florincoin,pascalguru/florincoin,florincoin/florincoin,capitalDIGI/litecoin,koharjidan/litecoin,pascalguru/florincoin,koharjidan/litecoin,tropa/axecoin,genavarov/brcoin,genavarov/ladacoin,capitalDIGI/litecoin,KibiCoin/kibicoin,my-first/octocoin,capitalDIGI/DIGI-v-0-10-4,genavarov/ladacoin,Electronic-Gulden-Foundation/egulden,pascalguru/florincoin,OstlerDev/florincoin,fullcoins/fullcoin,my-first/octocoin,fullcoins/fullcoin,genavarov/brcoin,pascalguru/florincoin,capitalDIGI/DIGI-v-0-10-4,Electronic-Gulden-Foundation/egulden,genavarov/lamacoin,Electronic-Gulden-Foundation/egulden,genavarov/brcoin,capitalDIGI/DIGI-v-0-10-4,capitalDIGI/litecoin,tropa/axecoin,octocoin-project/octocoin,florincoin/florincoin,tropa/axecoin,tropa/axecoin,Electronic-Gulden-Foundation/egulden,koharjidan/litecoin,OstlerDev/florincoin,genavarov/lamacoin,florincoin/florincoin,KibiCoin/kibicoin,octocoin-project/octocoin,octocoin-project/octocoin,my-first/octocoin,fullcoins/fullcoin,koharjidan/litecoin,koharjidan/litecoin,florincoin/florincoin,genavarov/ladacoin,KibiCoin/kibicoin,octocoin-project/octocoin,genavarov/lamacoin,tropa/axecoin,genavarov/ladacoin,OstlerDev/florincoin,Electronic-Gulden-Foundation/egulden,my-first/octocoin,octocoin-project/octocoin,OstlerDev/florincoin,OstlerDev/florincoin,florincoin/florincoin,genavarov/lamacoin,capitalDIGI/DIGI-v-0-10-4,tropa/axecoin,genavarov/lamacoin,KibiCoin/kibicoin,genavarov/brcoin,genavarov/brcoin,capitalDIGI/litecoin,pascalguru/florincoin,genavarov/ladacoin,capitalDIGI/DIGI-v-0-10-4,koharjidan/litecoin,florincoin/florincoin,genavarov/brcoin,KibiCoin/kibicoin,my-first/octocoin,OstlerDev/florincoin,fullcoins/fullcoin,Electronic-Gulden-Foundation/egulden,KibiCoin/kibicoin,fullcoins/fullcoin,capitalDIGI/litecoin,capitalDIGI/litecoin,fullcoins/fullcoin