[bugfix] Include platform to ldlogger.so path

A previous improvement in commit db924b0 requires that ldlogger.so
file is available in a directory named the current platform. When
building a Python package from CodeChecker, this ldlogger.so is not
placed in such a directory.
This patch fixes this issue.

setup.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 import os
+import platform
 import setuptools
 import subprocess
 import sys
@@ -102,7 +103,7 @@ def init_packages():
 
 class BuildExt(build_ext):
     def get_ext_filename(self, ext_name):
-        return f"{os.path.join(*ext_name.split('.'))}.so"
+        return f"{platform.uname().machine}/{ext_name}.so"
 
     def build_extension(self, ext):
         if sys.platform == "linux":