Extend --copy-dt-needed-entries to creating DSO

Extend --copy-dt-needed-entries to creating DSO

ld/

	PR ld/14915
	* emultempl/elf32.em (gld${EMULATION_NAME}_after_open): Also
	check DT_NEEDED entries when creating shared object with
	--copy-dt-needed-entries.

ld/testsuite/

	PR ld/14915
	* ld-elf/shared.exp (build_tests): Test --add-needed,
	--copy-dt-needed-entries, --no-add-needed and
	--no-copy-dt-needed-entries with -shared.
	Add tests for --no-add-needed and --no-copy-dt-needed-entries
	with -shared.