only build one android apk on Travis (take 3...)
only build one android apk on Travis (take 3...)

follow-up 8404e0706191b8dcca7d1c5ed37c947594606904

pooler/electrum-ltc,pooler/electrum-ltc,pooler/electrum-ltc,vialectrum/vialectrum,vialectrum/vialectrum,spesmilo/electrum,vialectrum/vialectrum,pooler/electrum-ltc,wakiyamap/electrum-mona,wakiyamap/electrum-mona,spesmilo/electrum,spesmilo/electrum,spesmilo/electrum,wakiyamap/electrum-mona,wakiyamap/electrum-mona