x86_64: Updating makefile to avoid early fail of other projects build

x86_64 porting should be done later

Change-Id: I73b336b1c46cb2c95dfacfc33aec490be9e357a7
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>
Merge "x86_64: Updating makefile to avoid early fail of other projects build"
Make part of the elf_writer_test specific to the portable build.

Change-Id: Ic24d04b71a0267ed3a7c7fe4e7b167644b8c96e0
Merge "Make part of the elf_writer_test specific to the portable build."
Merge branch 'master' of https://android.googlesource.com/platform/art into HEAD