readelf: Print split DWARF CU version, unit type and id

readelf: Print split DWARF CU version, unit type and id

When printing the split units we reused the version, unit type and id
found in the skeleton unit. The version and id really should match,
but the unit type shouldn't. We could hard code the expected values,
but it is better to look them up explicitly. One testcase needed
updating to show the correct split_compile unit type.

	* src/readelf.c (print_debug_units): Call dwarf_cu_die and
	dwarf_cu_info to explicitly fetch split_version,
	split_unit_type and split_unit_id.
	* tests/run-readelf-loc.sh: Adjust Unit type.

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