Libraries are arch-qualified

Building pyside 6.2.4 *with CMake* creates:

libpyside6.cpython-310-x86_64-linux-gnu.so.6.2.4
libshiboken6.cpython-310-x86_64-linux-gnu.so.6.2.4

Libraries should not be arch-qualified, and arch-qualification should not be part of the SONAME:

$ objdump -x libpyside6.cpython-310-x86_64-linux-gnu.so.6.2.4 | grep SONAME
 SONAME               libpyside6.cpython-310-x86_64-linux-gnu.so.6.2
$ objdump -x libshiboken6.cpython-310-x86_64-linux-gnu.so.6.2.4 | grep SONAME
 SONAME               libshiboken6.cpython-310-x86_64-linux-gnu.so.6.2

In fact ideally the builder should be able to specify the lib destination, much like what it is done for qtbase. This would enable us maintainers to do multi-arch builds.