[rubygems/rubygems] Handle non-gnu libc on linux platforms in RubyGems

Attempting to install a gem published as both *-linux and *-linux-musl
results in the incorrect gem being picked up, causing build failures due
to binary incompatibility. This is caused by the `nil` wildcard
swallowing the libc information upon version comparison.

Handle the linux case by performing only non-wildcard equality on the
version and asserting 'gnu' and nil equivalence, while preserving the
current behaviour for other OSes.

https://github.com/rubygems/rubygems/commit/9eead86abc

Co-authored-by: Loic Nageleisen <loic.nageleisen@gmail.com>

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