591106 add easy building of git snapshots

Authored and Committed by Michal Schmidt 12 years ago
    add easy building of git snapshots
    
    add make-git-snapshot.sh to make a tarball from upstream git.
    if %global gitcommit is defined on the top, a snapshot is being built.
    don't BuildRequire auto-tools to build from release tarballs.
    
        
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+14 -5