Change libLAS API to work with FILE* instead of fd.

This change is needed to workaround limitation of GNU stdio_filebuf class. When
working with file descriptors, ~stdio_filebuf() closes the descriptor. However
when working with FILE*, it doesn't. And we don't want to close it.

Signed-off-by: Adam Tkac <adam.tkac@geodis.cz>
Distribute incomplete lrzip support sources.

Signed-off-by: Adam Tkac <adam.tkac@geodis.cz>