Allow building with Qt4 (strictly Qt<5.2)
Allow building with Qt4 (strictly Qt<5.2)

Building against Qt4 fails with compilation error:
qt/masternodelist.cpp: In member function ‘void MasternodeList::updateMyMasternodeInfo(QString, QString, masternode_info_t&)’:
qt/masternodelist.cpp:193:172: error: ‘class QDateTime’ has no member named ‘offsetFromUtc’

This change pulls in the fix for the identical Dash issue 1671/1672
   https://github.com/dashpay/dash/pull/1672/commits/7a5654d75265147324fc9c26fb80d401c7ca8239

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