Add new /usr/bin/dtrace to build deps
    
    This is a part of approved Fedora change:
    https://fedoraproject.org/wiki/Changes/Separate_dtrace_package
    
    systemtap-sdt-devel will stop requiring systemtap-sdt-dtrace
    and that would break the build of this package because
    systemtap-sdt-devel no longer provides /usr/bin/dtrace.