[compiler-rt] [compiler-rt][test] Use packaging.version.Version to compare glibc versions (PR #142596)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

I have a random theory that the new package is bailing on "invalid" versions like `.` or `2.` when the old package wasn't

https://github.com/llvm/llvm-project/pull/142596