Bug#940176: libptscotch-6.0: typo in name of libptesmumps-6.so

[Drew Parsons]

Package: libptscotch-dev
Followup-For: Bug #940176

scotch 6.0.8-1~exp2 is not yet ready for use, it has a broken build,
which is why it is in experimental.

I recommend using 6.0.7 in the mean time.

Drew