libdwfl: Skip segment that starts past contents_size in elf-from-memory

libdwfl: Skip segment that starts past contents_size in elf-from-memory

When rebuilding an ELF from process memory, segments_end used the last
PT_LOAD segment's end rather than the largest, so a later smaller
segment could shrink contents_size below an earlier segment's start,
underflowing end - start into a huge length and overflowing the heap
buffer. Skip any segment that starts past contents_size, matching the
guard already used in dwfl_segment_report_module.

	* libdwfl/elf-from-memory.c (elf_from_remote_memory): Skip
	out-of-range segment.

Signed-off-by: Sayed Kaif <skaif@digiscrypt.com>