[3.11] gh-110190: Fix ctypes structs with array on PPCLE64 (GH-112959) (#113167)

Fix the same issue of PR #112604 on PPC64LE platform
Refactor tests to make easier to add more platfroms if needed.

(cherry picked from commit 6644ca45cde9ca1b80513a90dacccfeea2d98620)
Change-Id: I1ada30808c0d593a43eca3fa7a628c26bc276310