bin/45015: ld.elf_so: support ELF symbol versioning.

[nonakap%gmail.com@localhost]

>Number:         45015
>Category:       bin
>Synopsis:       ld.elf_so: support ELF symbol versioning.
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Thu Jun 02 15:30:00 +0000 2011
>Originator:     NONAKA Kimihiro
>Release:        5.99.22
>Organization:
>Environment:
NetBSD koharu.myhome.local 5.99.52 NetBSD 5.99.52 (TPX201) #1596: Thu Jun  2 
23:41:35 JST 2011  
root@koharu.myhome.local:/usr/obj.i386/sys/arch/i386/compile/TPX201 i386
>Description:
Currently NetBSD's ld.elf_so does not support ELF symbol versioning.
I ported it from FreeBSD rtld-elf.

>How-To-Repeat:
Currently NetBSD's ld.elf_so does not support ELF symbol versioning.

>Fix:
Please apply the patch.
ftp://ftp.netbsd.org/pub/NetBSD/misc/nonaka/misc/20110602-nbsd-ld.elf_so-symbol-versioning.diff