Use gold linker on x86

Patch removes fallback -fuse-ld=bfd for x86 target and
--copy-dt-needed-entries which is not supported by gold linker.

Change-Id: Ie5603f98e3f2f9d4f81678c718e39b130a75d057
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>