PR25477, ld 2.34 tries to load ${prefix}/etc/ld.so.conf

	PR 25477
	* ldelf.c (ldelf_check_ld_so_conf): Add prefix parameter and
	correct concat.
	(ldelf_after_open): Add prefix parameter.
	* ldelf.h (ldelf_after_open): Update prototype.
	* emultempl/elf.em (gld${EMULATION_NAME}_after_open): Pass $prefix
	to ldelf_after_open.
	* Makefile.am: Correct z80 dependencies.
	* Makefile.in: Regenerate.

(cherry picked from commit ef8f08ca13f6c111cc549a3e13be5c5e2d95ca82)