Version 2.5.1 packaging

Hi,

Quite a while ago I released libhinwa v2.5.1 for minor code fixes and test improvements.

• https://github.com/alsa-project/libhinawa/releases/tag/2.5.1

The micro version has no changes for symbol table, thus the same table is available in v2.5.0.

• #20 (closed)

Thanks