libdwfl: Make sure note data is properly aligned.

libdwfl: Make sure note data is properly aligned.

In dwfl_segment_report_module the note data might not be properly
aligned. Check that it is before accessing the data directly.
Otherwise convert data so it is properly aligned.

Also fix NOTE_ALIGN4 and NOTE_ALIGN8 to work correctly with long
types.

Signed-off-by: Mark Wielaard <mark@klomp.org>