Bug#794736: libvigraimpex: library transition is needed when GCC 5 is the default

[Daniel Stender]

The transition(s) of Vigra (1.10.0 and lib5v5) is just around the corner. We're
checking the reverse-deps, all works/builds fine instead of current 3depict [1],
and I've faced some problems with libreoffice ([2], also not related to libvigraimpex-dev,
though). Yet little busy, but this is going to completed soon.

Thanks,
Daniel Stender

[1] https://bugs.debian.org/798858
    3depict: FTBFS against mathgl 2.3.3

[2] http://www.danielstender.com/vigra/libreoffice_5.0.1-1_amd64-20150911-2300.build

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