libdwfl: Handle unaligned Ehdr in dwfl_segment_report_module

libdwfl: Handle unaligned Ehdr in dwfl_segment_report_module

The xlate functions only handle correctly aligned buffers. But they do
handle src == dest. So if the source buffer isn't aligned correctly
just copy it first into the destination (which is already correctly
aligned).

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