libc/glibc: let glibc 3.3.6 link correctly

From http://sourceware.org/git/?p=glibc.git;a=commit;f=elf/Makefile;h=7c8a67320e26b8c11108bf0a3410d3aef9cf3486

Author: Ulrich Drepper <drepper@redhat.com>:
Commit log:
* elf/Makefile (ld.so): Adjust the sed script to insert _begin in to
newer linker scripts.

Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>

 This is NOT the official version of dialog.  This version has been

 significantly modified from the original.  It is for use by the Linux

 kernel configuration script.  Please do not bother Savio Lam with 

 questions about this program.