package/libsigrokdecode: fix build with python > 3.10

Fix the following build failure with sigrok-cli and python > 3.10:

/home/autobuild/autobuild/instance-3/output-1/host/lib/gcc/mips64-buildroot-linux-gnu/11.3.0/../../../../mips64-buildroot-linux-gnu/bin/ld: /home/autobuild/autobuild/instance-3/output-1/host/bin/../mips64-buildroot-linux-gnu/sysroot/usr/lib/libsigrokdecode.so: undefined reference to `PyTuple_SetItem'

Fixes:
 - http://autobuild.buildroot.org/results/435ad19597a1e216a7974bc9ccaf17064d1eccea



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>