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Since Rubygems 3.3.21, the Gem::Platform name always contains the
library version for gnu platforms. So where the rake-compiler config
entries previously were:
```yaml
---
rbconfig-x86_64-linux-gnu-2.7.0: "/usr/local/rake-compiler/ruby/x86_64-redhat-linux/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux-gnu/rbconfig.rb"
rbconfig-x86_64-linux-2.7.0: "/usr/local/rake-compiler/ruby/x86_64-redhat-linux/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux-gnu/rbconfig.rb"
```
with later versions of rubygems, it is only
```yaml
---
rbconfig-x86_64-linux-gnu-2.7.0: "/usr/local/rake-compiler/ruby/x86_64-redhat-linux/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux-gnu/rbconfig.rb"
```
This means that the current way of finding a matching runtime, by doing
a string comparison on the config keys, is no longer appropriate. This
is causing failing builds downstream in `rake-compiler-dock`.
This PR:
- extracts a new CompilerConfig class to encapsulate the logic
- uses `Gem::Platform#=~` to tell if the gem platform matches the
runtime platform
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