release: remove libc6 dependency from the osx signing descriptor
release: remove libc6 dependency from the osx signing descriptor

It is unneeded after the last toolchain update, and missing from Trusty.

Github-Pull: #7342
Rebased-From: 3503a78670d0eacf39c618b45b08581dfb3ed68f

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coin/faircoin,diggcoin/diggcoin,dashpay/dash,ivansib/sib16,argentumproject/argentum,arruah/ensocoin,myriadteam/myriadcoin,myriadcoin/myriadcoin,marlengit/BitcoinUnlimited,dgenr8/bitcoin,schinzelh/dash,gjhiggins/vcoincore,biblepay/biblepay,Justaphf/BitcoinUnlimited,UdjinM6/dash,RyanLucchese/energi,marlengit/BitcoinUnlimited,ionomy/ion,SartoNess/BitcoinUnlimited,ivansib/sibcoin,lakepay/lake,faircoin/faircoin2,alejandromgk/Lunar,goku1997/bitcoin,marlengit/BitcoinUnlimited,jaromil/faircoin2,zetacoin/zetacoin,zander/bitcoinclassic,arruah/ensocoin,ionomy/ion,Kore-Core/kore,UdjinM6/dash,dmrtsvetkov/flowercoin,Kore-Core/kore,BitcoinUnlimited/BitcoinUnlimited,faircoin/faircoin,adpg211/bitcoin-master,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,SartoNess/BitcoinUnlimited,HeliumGas/helium,zander/bitcoinclassic,marlengit/hardfork_prototype_1_mvf-bu,aspirecoin/aspire,ivansib/sibcoin,lakepay/lake,SartoNess/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,thelazier/dash,Flurbos/Flurbo,Flurbos/Flurbo,BTCfork/hardfork_prototype_1_mvf-bu,jmgilbert2/energi,adpg211/bitcoin-master,diggcoin/diggcoin,Bitcoin-com/BUcash,multicoins/marycoin,terracoin/terracoin,nmarley/dash,schinzelh/dash,projectinterzone/ITZ,multicoins/marycoin,myriadcoin/myriadcoin,dmrtsvetkov/flowercoin,arruah/ensocoin,RyanLucchese/energi,zsulocal/bitcoin,AllanDoensen/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,willwray/dash,Bitcoin-com/BUcash,BTCfork/hardfork_prototype_1_mvf-bu,goku1997/bitcoin,biblepay/biblepay,BlockchainTechLLC/3dcoin,BTCfork/hardfork_prototype_1_mvf-core,Flurbos/Flurbo,faircoin/faircoin,crowning-/dash,HeliumGas/helium,BlockchainTechLLC/3dcoin,nmarley/dash,jmgilbert2/energi,Petr-Economissa/gvidon,dmrtsvetkov/flowercoin,zetacoin/zetacoin,biblepay/biblepay,lclc/bitcoin,willwray/dash,biblepay/biblepay,gjhiggins/vcoincore,dgenr8/bitcoin,RyanLucchese/energi,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,ediston/energi,PandaPayProject/PandaPay,zander/bitcoinclassic,Kore-Core/kore,bitpay/bitcoin,schinzelh/dash,lclc/bitcoin,bitcoinclassic/bitcoinclassic,zander/bitcoinclassic,goku1997/bitcoin,RyanLucchese/energi,argentumproject/argentum,dgenr8/bitcoin,jmgilbert2/energi,willwray/dash,PandaPayProject/PandaPay,projectinterzone/ITZ,zsulocal/bitcoin,ionomy/ion,adpg211/bitcoin-master,ivansib/sibcoin,schinzelh/dash,krzysztofwos/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,BTCfork/hardfork_prototype_1_mvf-core,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,dgenr8/bitcoin,BitcoinUnlimited/BitcoinUnlimited,nmarley/dash,bitpay/bitcoin,ediston/energi,goku1997/bitcoin,aspirecoin/aspire,aspirecoin/aspire,BTCfork/hardfork_prototype_1_mvf-core,Petr-Economissa/gvidon,ivansib/sib16,arruah/ensocoin,marcusdiaz/BitcoinUnlimited,aspirecoin/aspire,projectinterzone/ITZ,BTCfork/hardfork_prototype_1_mvf-bu,myriadcoin/myriadcoin,lakepay/lake