bpo-26544: Fixed implementation of platform.libc_ver(). (GH-7684). (GH-8193) (GH-8196)

(cherry picked from commit 2a9b8babf0d09946ebebfdb2931cc0d3db5a1d3d).
(cherry picked from commit 7c43b801503c802ed6ea4b811f5bc73791249d94)
3 files changed