The basic tests now run on Windows correctly without needing to manually
copy any files -- the executables are output in the same location as the
necessary DLLs. However, tests that require *.pyd files (all code in the
Mod subdirectory, basically) still do not work on Windows as the test
executables cannot find those files. This is a work in progress.
* Assembly: fix building with external OndselSolver
This commit pairs with f35b075e271e9cb3451f3439f7dc0274841a0838.
It solves two issues:
- remove hardcoded includes of 3rdparty files
- add missing include_directories()
* Assembly: add check for external OndselSolver includes
