fix: add missing cmake_install_libdir

Author: HolgerNahrstaedt

setup.py

@@ -93,6 +93,7 @@ def run(self):  # noqa: C901
         # Build the library using CMake
         cmake_args = [
             "-DCMAKE_INSTALL_PREFIX=" + os.getcwd(),
+            "-DCMAKE_INSTALL_LIBDIR=lib",  # Explicitly set install libdir
             "-DBUILD_SHARED_LIBS=OFF",  # Build static library
             f"-DCMAKE_BUILD_TYPE={self.build_type}",
             "-DCMAKE_CXX_STANDARD=14",