1196876 Update to 0.15.3

Authored and Committed by jgu 8 years ago
    Update to 0.15.3
    Remove xpra-0.15.2-9768.patch
    Add BuildRequires for redhat-lsb-core to make lsb_release available
    at build time (used to detect system type)
    Add --with-Xdummy and --with-Xdummy_wrapper to install options to
    ensure Xdummy is used
    
        
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