fix windows build script: pushd and popd require bash
fix windows build script: pushd and popd require bash

spesmilo/electrum,pooler/electrum-ltc,romanz/electrum,neocogent/electrum,romanz/electrum,neocogent/electrum,spesmilo/electrum,spesmilo/electrum,pooler/electrum-ltc,fyookball/electrum,vialectrum/vialectrum,cryptapus/electrum,asfin/electrum,fyookball/electrum,kyuupichan/electrum,neocogent/electrum,spesmilo/electrum,wakiyamap/electrum-mona,cryptapus/electrum,fyookball/electrum,kyuupichan/electrum,digitalbitbox/electrum,pooler/electrum-ltc,fujicoin/electrum-fjc,fujicoin/electrum-fjc,digitalbitbox/electrum,wakiyamap/electrum-mona,wakiyamap/electrum-mona,digitalbitbox/electrum,vialectrum/vialectrum,asfin/electrum,kyuupichan/electrum,digitalbitbox/electrum,vialectrum/vialectrum,cryptapus/electrum,fujicoin/electrum-fjc,pooler/electrum-ltc,asfin/electrum,romanz/electrum,wakiyamap/electrum-mona