guix: Remove now-unnecessary gcc make flag
guix: Remove now-unnecessary gcc make flag

Previously, Guix would produce a gcc which did not know to use the SSP
function from glibc, and required a gcc make flag for it to do so, in my
attempt to fix it upstream I realized that this is no longer the case.

This can be verified by performing a Guix build and doing

  readelf -s ... | grep __stack_chk

to check that symbols are coming from glibc, and doing

  readelf -d ... | grep NEEDED | grep ssp

to see that libssp.so is not being depended on

EthanHeilman/bitcoin,vertcoin/vertcoin,peercoin/peercoin,jonasschnelli/bitcoin,JeremyRubin/bitcoin,apoelstra/bitcoin,Sjors/bitcoin,anditto/bitcoin,ElementsProject/elements,bitcoinknots/bitcoin,namecoin/namecoin-core,cdecker/bitcoin,rnicoll/dogecoin,litecoin-project/litecoin,yenliangl/bitcoin,qtumproject/qtum,pstratem/bitcoin,bitcoin/bitcoin,instagibbs/bitcoin,Sjors/bitcoin,alecalve/bitcoin,fanquake/bitcoin,dscotese/bitcoin,pstratem/bitcoin,jlopp/statoshi,dscotese/bitcoin,andreaskern/bitcoin,kallewoof/bitcoin,cdecker/bitcoin,practicalswift/bitcoin,GroestlCoin/GroestlCoin,Xekyo/bitcoin,AkioNak/bitcoin,lateminer/bitcoin,MarcoFalke/bitcoin,n1bor/bitcoin,jlopp/statoshi,bitcoinsSG/bitcoin,jnewbery/bitcoin,Sjors/bitcoin,fujicoin/fujicoin,lateminer/bitcoin,midnightmagic/bitcoin,GroestlCoin/bitcoin,fujicoin/fujicoin,jnewbery/bitcoin,ajtowns/bitcoin,rnicoll/bitcoin,AkioNak/bitcoin,namecoin/namecore,domob1812/namecore,ElementsProject/elements,pataquets/namecoin-core,fanquake/bitcoin,namecoin/namecoin-core,litecoin-project/litecoin,monacoinproject/monacoin,sstone/bitcoin,namecoin/namecore,bitcoinknots/bitcoin,jlopp/statoshi,ElementsProject/elements,jonasschnelli/bitcoin,vertcoin/vertcoin,lateminer/bitcoin,bitcoinsSG/bitcoin,jamesob/bitcoin,midnightmagic/bitcoin,jambolo/bitcoin,AkioNak/bitcoin,jonasschnelli/bitcoin,qtumproject/qtum,JeremyRubin/bitcoin,andreaskern/bitcoin,MarcoFalke/bitcoin,rnicoll/dogecoin,andreaskern/bitcoin,mruddy/bitcoin,bitcoinknots/bitcoin,mm-s/bitcoin,achow101/bitcoin,jonasschnelli/bitcoin,fanquake/bitcoin,EthanHeilman/bitcoin,AkioNak/bitcoin,ahmedbodi/vertcoin,yenliangl/bitcoin,bitcoin/bitcoin,peercoin/peercoin,ahmedbodi/vertcoin,mm-s/bitcoin,jamesob/bitcoin,litecoin-project/litecoin,qtumproject/qtum,mruddy/bitcoin,jambolo/bitcoin,MeshCollider/bitcoin,tecnovert/particl-core,bitcoinsSG/bitcoin,GroestlCoin/GroestlCoin,pataquets/namecoin-core,bitcoin/bitcoin,mm-s/bitcoin,n1bor/bitcoin,qtumproject/qtum,alecalve/bitcoin,MarcoFalke/bitcoin,bitcoin/bitcoin,rnicoll/dogecoin,domob1812/bitcoin,tecnovert/particl-core,sipsorcery/bitcoin,tecnovert/particl-core,jamesob/bitcoin,kallewoof/bitcoin,sipsorcery/bitcoin,jambolo/bitcoin,Xekyo/bitcoin,Xekyo/bitcoin,bitcoinsSG/bitcoin,domob1812/bitcoin,GroestlCoin/GroestlCoin,andreaskern/bitcoin,JeremyRubin/bitcoin,DigitalPandacoin/pandacoin,EthanHeilman/bitcoin,rnicoll/dogecoin,jonasschnelli/bitcoin,GroestlCoin/GroestlCoin,MarcoFalke/bitcoin,MeshCollider/bitcoin,pstratem/bitcoin,sstone/bitcoin,achow101/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,monacoinproject/monacoin,Xekyo/bitcoin,vertcoin/vertcoin,midnightmagic/bitcoin,mruddy/bitcoin,peercoin/peercoin,monacoinproject/monacoin,ElementsProject/elements,AkioNak/bitcoin,mruddy/bitcoin,n1bor/bitcoin,namecoin/namecoin-core,qtumproject/qtum,prusnak/bitcoin,pataquets/namecoin-core,DigitalPandacoin/pandacoin,particl/particl-core,ElementsProject/elements,JeremyRubin/bitcoin,kallewoof/bitcoin,yenliangl/bitcoin,sipsorcery/bitcoin,DigitalPandacoin/pandacoin,MarcoFalke/bitcoin,lateminer/bitcoin,pstratem/bitcoin,fanquake/bitcoin,kallewoof/bitcoin,jamesob/bitcoin,prusnak/bitcoin,pstratem/bitcoin,midnightmagic/bitcoin,particl/particl-core,alecalve/bitcoin,n1bor/bitcoin,dscotese/bitcoin,peercoin/peercoin,Sjors/bitcoin,andreaskern/bitcoin,ajtowns/bitcoin,practicalswift/bitcoin,yenliangl/bitcoin,domob1812/namecore,GroestlCoin/GroestlCoin,fujicoin/fujicoin,cdecker/bitcoin,bitcoin/bitcoin,litecoin-project/litecoin,jnewbery/bitcoin,apoelstra/bitcoin,ahmedbodi/vertcoin,vertcoin/vertcoin,domob1812/bitcoin,GroestlCoin/bitcoin,tecnovert/particl-core,ElementsProject/elements,mm-s/bitcoin,litecoin-project/litecoin,peercoin/peercoin,bitcoinknots/bitcoin,sipsorcery/bitcoin,instagibbs/bitcoin,fanquake/bitcoin,MeshCollider/bitcoin,domob1812/namecore,namecoin/namecore,rnicoll/bitcoin,lateminer/bitcoin,MeshCollider/bitcoin,namecoin/namecore,ajtowns/bitcoin,bitcoinsSG/bitcoin,mruddy/bitcoin,anditto/bitcoin,achow101/bitcoin,andreaskern/bitcoin,peercoin/peercoin,prusnak/bitcoin,anditto/bitcoin,rnicoll/bitcoin,AkioNak/bitcoin,apoelstra/bitcoin,fujicoin/fujicoin,rnicoll/bitcoin,sstone/bitcoin,pataquets/namecoin-core,anditto/bitcoin,practicalswift/bitcoin,sipsorcery/bitcoin,practicalswift/bitcoin,qtumproject/qtum,midnightmagic/bitcoin,prusnak/bitcoin,jambolo/bitcoin,jamesob/bitcoin,sstone/bitcoin,namecoin/namecoin-core,litecoin-project/litecoin,monacoinproject/monacoin,GroestlCoin/bitcoin,fanquake/bitcoin,domob1812/namecore,DigitalPandacoin/pandacoin,practicalswift/bitcoin,pataquets/namecoin-core,EthanHeilman/bitcoin,instagibbs/bitcoin,ajtowns/bitcoin,particl/particl-core,jnewbery/bitcoin,mruddy/bitcoin,tecnovert/particl-core,jambolo/bitcoin,bitcoinknots/bitcoin,instagibbs/bitcoin,fujicoin/fujicoin,ahmedbodi/vertcoin,MeshCollider/bitcoin,monacoinproject/monacoin,cdecker/bitcoin,achow101/bitcoin,MeshCollider/bitcoin,rnicoll/bitcoin,alecalve/bitcoin,jamesob/bitcoin,rnicoll/bitcoin,DigitalPandacoin/pandacoin,apoelstra/bitcoin,particl/particl-core,anditto/bitcoin,GroestlCoin/GroestlCoin,EthanHeilman/bitcoin,namecoin/namecore,dscotese/bitcoin,achow101/bitcoin,kallewoof/bitcoin,prusnak/bitcoin,DigitalPandacoin/pandacoin,pstratem/bitcoin,rnicoll/dogecoin,sipsorcery/bitcoin,midnightmagic/bitcoin,Xekyo/bitcoin,dscotese/bitcoin,sstone/bitcoin,apoelstra/bitcoin,ahmedbodi/vertcoin,yenliangl/bitcoin,cdecker/bitcoin,EthanHeilman/bitcoin,dscotese/bitcoin,instagibbs/bitcoin,particl/particl-core,fujicoin/fujicoin,anditto/bitcoin,mm-s/bitcoin,vertcoin/vertcoin,mm-s/bitcoin,achow101/bitcoin,particl/particl-core,lateminer/bitcoin,apoelstra/bitcoin,jlopp/statoshi,JeremyRubin/bitcoin,practicalswift/bitcoin,instagibbs/bitcoin,cdecker/bitcoin,domob1812/bitcoin,Xekyo/bitcoin,vertcoin/vertcoin,namecoin/namecore,prusnak/bitcoin,domob1812/namecore,pataquets/namecoin-core,jlopp/statoshi,ahmedbodi/vertcoin,alecalve/bitcoin,GroestlCoin/bitcoin,jlopp/statoshi,kallewoof/bitcoin,sstone/bitcoin,bitcoinsSG/bitcoin,ajtowns/bitcoin,GroestlCoin/bitcoin,GroestlCoin/bitcoin,monacoinproject/monacoin,JeremyRubin/bitcoin,n1bor/bitcoin,MarcoFalke/bitcoin,bitcoin/bitcoin,qtumproject/qtum,domob1812/bitcoin,namecoin/namecoin-core,Sjors/bitcoin,tecnovert/particl-core,jambolo/bitcoin,jnewbery/bitcoin,n1bor/bitcoin,domob1812/bitcoin,domob1812/namecore,yenliangl/bitcoin,alecalve/bitcoin