NotImplementedError raised on Linux AArch64 for multiprocessing qsize()

### Solution to issue cannot be found in the documentation.

- [x] I checked the documentation.

### Issue

As noted on https://docs.python.org/3/library/multiprocessing.html#multiprocessing.Queue.qsize, `sem_getvalue` isn't implemented on certain platforms but should work on AArch64 Linux.

This is checked at build time here:
https://github.com/python/cpython/blob/0d582def34babca7417ece8a9e4e16cc2a752d44/configure.ac#L6178

Using the default Python interpreter on Ubuntu this error doesn't appear. There's an ancient fix here: https://bugs.launchpad.net/bugs/630511

Reproducer:
```
import multiprocessing

queue = multiprocessing.Queue()

print(queue.qsize())
```

With Ubuntu Python:
```
$ /usr/bin/python3.10 ~/repo.py
0
```

With conda-forge Python (tested with both `3.10` and `3.13`):
```
$ /opt/conda/envs/py_3.13/bin/python ~/repo.py
Traceback (most recent call last):
File "/var/lib/jenkins/repo.py", line 5, in
print(queue.qsize())
~~~~~~~~~~~^^
File "/opt/conda/envs/py_3.13/lib/python3.13/multiprocessing/queues.py", line 124, in qsize
return self._maxsize - self._sem._semlock._get_value()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
NotImplementedError
```

### Installed packages

```shell
# packages in environment at /opt/conda/envs/py_3.13:
#
# Name Version Build Channel
_openmp_mutex 4.5 2_gnu
bzip2 1.0.8 h68df207_7
ca-certificates 2025.6.15 hbd8a1cb_0
ld_impl_linux-aarch64 2.43 h5e2c951_5
libexpat 2.7.0 h5ad3122_0
libffi 3.4.6 he21f813_1
libgcc 15.1.0 he277a41_2
libgcc-ng 15.1.0 he9431aa_2
libgomp 15.1.0 he277a41_2
liblzma 5.8.1 h86ecc28_2
libmpdec 4.0.0 h86ecc28_0
libsqlite 3.50.1 h5eb1b54_0
libuuid 2.38.1 hb4cce97_0
libzlib 1.3.1 h86ecc28_2
ncurses 6.5 ha32ae93_3
openssl 3.5.0 hd08dc88_1
pip 25.1.1 pyh145f28c_0
python 3.13.5 h2382df9_102_cp313
python_abi 3.13 7_cp313
readline 8.2 h8382b9d_2
tk 8.6.13 noxft_h5688188_102
tzdata 2025b h78e105d_0
```

### Environment info

```shell
active environment : py_3.13
active env location : /opt/conda/envs/py_3.13
shell level : 2
user config file : /var/lib/jenkins/.condarc
populated config files : /opt/conda/.condarc
conda version : 25.3.0
conda-build version : not installed
python version : 3.12.10.final.0
solver : libmamba (default)
virtual packages : __archspec=1=aarch64
__conda=25.3.0=0
__glibc=2.35=0
__linux=6.8.0=0
__unix=0=0
base environment : /opt/conda (writable)
conda av data dir : /opt/conda/etc/conda
conda av metadata url : None
channel URLs : https://artifactory.arm.com/artifactory/api/conda/mirrors.conda-forge/linux-aarch64
https://artifactory.arm.com/artifactory/api/conda/mirrors.conda-forge/noarch
package cache : /opt/conda/pkgs
/var/lib/jenkins/.conda/pkgs
envs directories : /opt/conda/envs
/var/lib/jenkins/.conda/envs
platform : linux-aarch64
user-agent : conda/25.3.0 requests/2.32.3 CPython/3.12.10 Linux/6.8.0-50-generic ubuntu/22.04.5 glibc/2.35 solver/libmamba conda-libmamba-solver/25.3.0 libmambapy/2.1.1
UID:GID : 1000:1000
netrc file : None
offline mode : False
```