[dune-pdelab] [PATCH] dune-typetree: update pkg-config & autoconf test

[Ansgar Burchardt]

Hi,

the last commit to dune-typetree (46779ad66a02e) removed the shared
library, but dune-typetree.pc.in still has -ldunetypetree and the
DUNE_TYPETREE_CHECK_MODULE macro refers to emptyNodePtr which is gone.

Please consider merging the master branch from my repository on
Github[1]. Besides the fix for the issue above it also fixes a typo.

Ansgar

  [1] https://github.com/aburch/dune-typetree.git