PR25236, common sym versioning

PR25236, common sym versioning

In cases where a relocatable object file has a common symbol, no other
file has a definition, and there is a matching common symbol found in
a shared library then ld will output a definition using the largest of
size and alignment for the commons.  This patch fixes a bug in ld that
ignored common symbols when assigning versions, resulting in such
symbols being given VER_NDX_LOCAL versions.

	PR 25236
	* elflink.c (_bfd_elf_link_assign_sym_version): Assign versions
	for ELF_COMMON_DEF_P symbols.
	(elf_link_output_extsym, _bfd_elf_add_default_symbol): Adjust to
	suit.