0.5.4:

This patch release includes a few fixes to the program logic and output,
as well as several improvements in slibtool's own build system.

- link mode: always create the .libs directory.
- output: flush stdout upon return from output functions.
- build system: remove generic dependency of object files on version.tag.
- build system: moved core definition files to a designated folder.
- build system: PE targets: handle subsystem setting in pe.mk.
- build system: added --avoid-version support.
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