c51477e gcc7 build fix for i686

Authored and Committed by myoung 7 years ago
    gcc7 build fix for i686
    proposed upstream fix for [XSA-206] build issue
    Qemu: 9pfs: host memory leakage via v9fs_create [CVE-2017-7377] (#1437873)
    x86: broken check in memory_exchange() permits PV guest breakout
    	[XSA-212, CVE-2017-7228] (#1438804)
    
        
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