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

[Daniel Stender]

We have a SONAME bump happening due to the Vigra 1.10.0 transition [1] which
generally could let spare a "v5" package when the two transitions would be combined,
isn't it?

However, I think it's better to adopt what has been already changed for 1.10.0+dfsg-9ubuntu1
to update Vigra for 15.10 (renaming libvigraimpex5 to libvigraimpexv5 and rebuild) - there's
really no need to avoid this.

We have some other serious issues open for Vigra (with the Lenna image set [2] and test suite
problems in Mips), so I suggest we do it that way: I'm going to prepare a "v5" 1.9.0+dfsg-11
for unstable in the next days and check the reverse deps. After that we go for a "v5"
1.10.0+dfsg-10 in experimental and check the reverse deps on that, that would close the
stdc++6 transition as the next thing to do on Vigra.

Daniel

[1] https://bugs.debian.org/793044 (transition: libvigraimpex)

[2] https://lists.debian.org/debian-devel/2015/08/msg00090.html

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