Fix LIBUGPIO_VERSION_HEX macro
Fix LIBUGPIO_VERSION_HEX macro

The result of the macro is left-shifted by an extra factor of 8 bits.
Also add a comment about the desired result.

Signed-off-by: Michael Heimpold <59934addbc17c0fa64a0bf4bb38537fc23439974@heimpold.de>

mhei/libugpio,mhei/libugpio