ld compact eh-frame leak

u.compact.extries wasn't being freed anywhere.  Free it when
destroying the linker hash table.  Also free u.dwarf.aray there in
case errors result in the linker not getting to the slightly earlier
free in write_dwarf_eh_frame_hdr.

	* elf-eh-frame.c (write_dwarf_eh_frame_hdr): Don't exit without
	freeing u.dwarf.array.
	* elflink.c (_bfd_elf_link_hash_table_free): Free u.compact.entries
	and u.dwarf.array.