ci: Minor cppcheck speedup #4268
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Description of changes:
We can get a speedup for cppcheck if we change how we compile it. From my testing, this seems to bring it down from 1:30-2:00 to 1:00-1:10. Most of the savings likely come from MATCHCOMPILER, but maybe the optimizations help a little?
For a bigger speedup we'll need a cache, like Cameron started to add in #2642.
Testing:
Here's one of my test runs: https://github.com/lrstewart/s2n/actions/runs/6661235504/job/18103779503?pr=31
We cache our build of cppcheck, but the cppcheck action doesn't run on main so this PR won't use a cached value from main without my build changes. I verified that by checking our caches: https://github.com/aws/s2n-tls/actions/caches
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.