Switch x86 default compiler to multilib version

Switch from gcc-4.7 32-bit only to gcc-4.7 multilib (32/x32/64) compiler.
Tested x86 image build on Linux and Darwin.

This bionic patch is required:
https://android-review.googlesource.com/#/c/64183

Change-Id: Ifc2c6c5d6a4a1b71a00a87af072bb7f67b1c284d
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>
Merge "Switch x86 default compiler to multilib version"
Add support for WITHOUT_CLANG

(cherry picked from commit 051a1740eb434e317451c09b72ae09c81cbfa1c1)

Change-Id: I60b7d1fa958557d13b74563c07f694b86d6a6d6f
Merge "Add support for WITHOUT_CLANG"
Merge https://android.googlesource.com/platform/build into jb-devel-mr2-release

Change-Id: Ic60696823c61ae4fff1aea415c99f2bbd6b9aaca