sharutils license correction

[Petr Pisar]

I've corrected license declaration at sharutils package:

- GPLv3+ and LGPLv2+ and Public Domain
+ GPLv3+ and LGPLv3+ and (LGPLv3+ or BSD) and LGPLv2+ and Public Domain and GFDL

The only effective difference is the texinfo documentation is covered by
GFDL instead of GPL.

The (LGPLv3+ or BSD) clause is because of bundled libopts that I will
try to unbundle or negotitate with FPC.

-- Petr