[PATCH] elf: Don't set its DT_VERSYM entry for unversioned symbol

[H.J. Lu]

Undefined symbol without version shouldn't have the BASE version in its
DT_VERSYM entry.  Instead its DT_VERSYM entry should be all zero to
indicate that the symbol doesn't have a version.

bfd/

PR ld/33577
* elflink.c (elf_link_output_extsym): Don't set its DT_VERSYM
entry for unversioned symbol.

ld/

PR ld/33577
* testsuite/ld-elf/undefined.d: New file.
* testsuite/ld-elf/undefined.map: Likewise.
* testsuite/ld-elf/undefined.s: Likewise.

OK for master?

Thanks.

-- 
H.J.
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