build: Depend on numpy<2 for build #575
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As initially reported in [Debian bug #1075317], nipy fails to build
from source with the following error since introduction of gcc 14, and
the promotion of several warnings as errors:
../lib/fff_python_wrapper/fffpy.c:17:3: error: returning ‘void *’ from a function with return type ‘IMP_OUT’ {aka ‘int’} makes integer from pointer without a cast [-Wint-conversion]
17 | import_array();
| ^~~~~~~~~~~~
This looks to be related to the logic revolving around setting the
type of IMP_OUT, as it does not know about the present import_array
macro "return type" in contemporary Numpy versions. Since Python 2 is
obsolete, this patch removes the Python major selector entirely to
replace by a hard wiring of the IMP_OUT type.
This may not be 100% suitable to everyone, but the time of
introduction of the void* return type to the import_array macro in
Numpy is unclear.
[Debian bug #1075317]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1075317
Signed-off-by: Étienne Mollier <emollier@debian.org>
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Numpy 2 broke builds, and there's no good way to test other issues while the build is failing. Supporting numpy 2 can be its own effort (#565).