[binutils-gdb] Add missing initializer to silence GCC 4.2

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT dd9e66ee9549c872fad36a21d521b68b14429f38 ***

Author: H.J. Lu <hjl.tools@gmail.com>
Branch: master
Commit: dd9e66ee9549c872fad36a21d521b68b14429f38

Add missing initializer to silence GCC 4.2

Silence GCC 4.2:

elf64-x86-64.c: In function elf_x86_64_get_synthetic_symtab:
elf64-x86-64.c:6490: warning: missing initializer
elf64-x86-64.c:6490: warning: (near initialization for plts[3].sec)

	* elf32-i386.c (elf_i386_get_synthetic_symtab): Add missing
	initializer for GCC 4.2.
	* lf64-x86-64.c (elf_x86_64_get_synthetic_symtab): Likewise.