glibcextract.py: Add compile_c_snippet
It might be used on tests to check if a snippet build with the provided
compiler and flags.
Reviewed-by: 
Florian Weimer <fweimer@redhat.com>
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It might be used on tests to check if a snippet build with the provided
compiler and flags.
Reviewed-by: Florian Weimer <fweimer@redhat.com>