Install git-prompt.sh in %{_sysconfdir}/profile.d
    
    With git-1.7.12, __git_ps1 has moved to a separate script.  This is to
    accommodate newer bash-completion which allows for dynamic loading of
    completion files.
    
    Having git-prompt.sh in profile.d ensures that the functions needed for
    git in the prompt are present regardless of whether bash-completion is
    installed or loaded.