build: fix package.cpath for Debian based distros

In Linux systems based on Debian, libraries are installed in paths
depending on the architecture. For example, /usr/lib/x86_64-linux-gnu/,
/usr/lib/aarch64-linux-gnu/. Some packages may be installed in these
paths, but Tarantool does not look for libraries installed in these
paths. This patch solves the problem.

Also remove redundant OS depended `if` branches.

Fix #9580

NO_DOC=bugfix
NO_TEST=bugfix