* Use LIBDIR and MULTIARCH on linux to find python library
* Remove apple-specific setting; the non-windows one should work fine on OS X
* Default LIBDIR/MULTIARCH to '' (to avoid getting None)
* Remove trailing whitespace from FindPythonLibsNew
Fixes#365. `sysconfig.get_config_var('SO')` already returns the correct
PYTHON_MODULE_EXTENSION, even for debug builds, so there is no need to
add anything else manually.
When run on windows in a venv, PYTHON_LIBRARY pointet to a non-existant
location in the virtual environment directory.
This has been fixed by testing if the path exists and, if not, trying
an alternative path, relative to the PYTHON_INCLUDE_DIR.
If the alternative path doesn't exit as well, an error will be raised.
