0.5.7:

This patch release contains one future-looking change in the project's
design, as well as a few improvements in slibtool's own build system.

- utility: added slbt_main() as a public interface, refactored accordingly.
- utility: improved box integration, removed need for build-time macro.
- build system: warn only upon failure to detect native size of pointer.
- build system: add a test for legacy gcc versions.
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