Bug#852279: libfltk1.3-dev: Do not try to move fltk.spec if saved

[Javier Serrano Polo]

Package: libfltk1.3-dev
Version: 1.3.4-1
Severity: wishlist

debian/rules runs
        mv fltk.spec fltk.spec.saved

If later operations are interrupted, the target cannot be run again;
clean target will not work either. Please consider to test if
fltk.spec.saved exists already.

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