[buildsystem,release] Generate cmake package configuration files with autotools
(cherry picked from commit bebf4fef6e5409fc9f6b3eedd0110a2622915aee)

Signed-off-by: Christoph Grüninger <gruenich@dune-project.org>
[autotools,bugfix] Fixes path of include rules for creating CMake pkg configuration files.

$(top_srcdir) was missing. Thanks to Tobias Malkmus for the hint.
(cherry picked from commit 0f7ddb5b4955eefd346766de99f7779aa6801ecc)

Signed-off-by: Christoph Grüninger <gruenich@dune-project.org>