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Signed-off-by: Olaf Hering <olaf@aepfle.de>

Signed-off-by: Olaf Hering <olaf@aepfle.de>

thunarx-python-object.c:70:5: error: no previous prototype for '__PyString_Check' [-Werror=missing-prototypes]
thunarx-python-object.c:78:7: error: no previous prototype for '__PyString_AsString' [-Werror=missing-prototypes]
Signed-off-by: Olaf Hering <olaf@aepfle.de>

thunarx-python.c:250:40: error: passing argument 3 of 'g_list_find_custom' from incompatible pointer type [-Werror=incompatible-pointer-types]
Signed-off-by: Olaf Hering <olaf@aepfle.de>

- respect --prefix option
- Remove old thunarx-python search directory

- Use a more standard makefile for gtk-doc
- gtk doc should be inlined in the source, but for now keep what we have
  in docs/reference/ dir

- Patch from nautilus-python: https://gitlab.gnome.org/GNOME/nautilus-python/-/commit/ddb29f5b176e04488c651f7e8d575fd309fc0697
- Update urls, years, remove useless m4 macro, re-add a gitignore file
- Fix some autohell warnings

Use g_return_val_if_fail instead of g_return_if_fail because this override function must have a return value