PR ld/2218

	PR ld/2218
	* elf32-arm.c (allocate_dynrelocs): Ensure undef weak sym in pie
	is dynamic.
	* elf32-hppa.c (allocate_dynrelocs): Likewise.
	* elf32-i386.c (allocate_dynrelocs): Likewise.
	* elf32-s390.c (allocate_dynrelocs): Likewise.
	* elf32-sh.c (allocate_dynrelocs): Likewise.
	* elf64-s390.c (allocate_dynrelocs): Likewise.
	* elf64-x86-64.c (allocate_dynrelocs): Likewise.
	* elf32-m32r.c (allocate_dynrelocs): Likewise.  Discard relocs
	on undef weak with non-default visibility too.
	* elfxx-sparc.c (allocate_dynrelocs): Ditto.