libdwfl: Make dwfl_segment_report_module aware of maximum Elf size

libdwfl: Make dwfl_segment_report_module aware of maximum Elf size

At the end of dwfl_segment_report_module we might try to read in
the whole contents described by a core file. To do this we first
allocate a zeroed block of memory that is as big as possible. The
core file however may describe much more loaded data than is actually
available in the Elf image. So pass the maximum size so we can
limit the amount of memory we reserve.

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