[Dune] Problem with latest dune-common / strangy error message with quadmath.hh

[Christoph Grüninger]

Hi Benedikt,
thanks for sharing the solution! Two days ago, a different fix was 
merded to superlu_DIST, see
https://github.com/xiaoyeli/superlu_dist/pull/210

As far as I know, SuperLU_dist has very few users in the Dune community. 
That is why it went unnoticed.

Bye
Christoph

-- 
Most customers will not accept source code with compile errors in it.
                  Dan Saks, CppCon 2016 (https://youtu.be/D7Sd8A6_fYU)