0.5.20:

This patch release includes several important bug fixes pertaining to both
the link and compile mode, as well as the addition of a compatible --features
output.

- driver: added slbt_output_features(), providing compatible --features output.
- driver: compatibility: have -{shared|static} imply -disable-{static|shared}.
- link mode: properly handle the combination of -release and -version-info.
- link mode: slbt_exec_link_create_dep_file(): record top-level -L arguments.
- link mode: --disable-{shared|static}: use differently-named placeholders.
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