ELF: Copy dyn_relocs in _bfd_elf_link_hash_copy_indirect

Copy dyn_relocs in _bfd_elf_link_hash_copy_indirect instead of in each
target backend.

	PR ld/26067
	* elf32-arm.c (elf32_arm_copy_indirect_symbol): Don't copy
	dyn_relocs.
	* elf32-csky.c (csky_elf_copy_indirect_symbol): Likewise.
	* elf32-hppa.c (elf32_hppa_copy_indirect_symbol): Likewise.
	* elf32-metag.c (elf_metag_copy_indirect_symbol): Likewise.
	* elf32-microblaze.c (microblaze_elf_copy_indirect_symbol):
	Likewise.
	* elf32-nds32.c (nds32_elf_copy_indirect_symbol): Likewise.
	* elf32-nios2.c (nios2_elf32_copy_indirect_symbol): Likewise.
	* elf32-or1k.c (or1k_elf_copy_indirect_symbol): Likewise.
	* elf32-s390.c (elf_s390_copy_indirect_symbol): Likewise.
	* elf32-sh.c (sh_elf_copy_indirect_symbol): Likewise.
	* elf32-tilepro.c (tilepro_elf_copy_indirect_symbol): Likewise.
	* elf64-s390.c (elf_s390_copy_indirect_symbol): Likewise.
	* elfnn-aarch64.c (elfNN_aarch64_copy_indirect_symbol): Likewise.
	* elfnn-riscv.c (riscv_elf_copy_indirect_symbol): Likewise.
	* elfxx-sparc.c (_bfd_sparc_elf_copy_indirect_symbol): Likewise.
	* elfxx-tilegx.c (tilegx_elf_copy_indirect_symbol): Likewise.
	* elfxx-x86.c (_bfd_x86_elf_copy_indirect_symbol): Likewise.
	* elf32-lm32.c (lm32_elf_copy_indirect_symbol): Removed.
	(elf_backend_copy_indirect_symbol): Likewise.
	* elf32-m32r.c (m32r_elf_copy_indirect_symbol): Removed.
	(elf_backend_copy_indirect_symbol): Likewise.
	* elflink.c (_bfd_elf_link_hash_copy_indirect): Copy dyn_relocs.