elf: Verify that there is only one default version When assigning the symbol version, verify that there is only one default version. bfd/ PR ld/34550 * elflink.c (_bfd_elf_link_assign_sym_version): Verify that there is only one default version. ld/ PR ld/34550 * testsuite/ld-elf/pr34550.d: New test. * testsuite/ld-elf/pr34550.t: Likewise. * testsuite/ld-elf/pr34550a.s: Likewise. * testsuite/ld-elf/pr34550b.s: Likewise. Signed-off-by: H.J. Lu <hjl.tools@gmail.com>