x86: Add proper gcc-4.4.3 x86 toolchain support.

This patch combines 7 AOSP patches to add proper support
to build x86 platform images using the 4.4.3 toolchain.

The Orig-Changed-Id fields below correspond to the change ids
of the original changes in the AOSP master branch history.

    Define __ANDROID__ for x86 to be on par with ARM build requirements
    Orig-Change-Id: I79c8f29af1f20b694f22a39f848216022809a5c6
Signed-off-by: Bruce Beare <brucex.j.beare@intel.com>

    Enables x86-atom as a valid TARGET_ARCH_VARIANT for the simulator build.
    Orig-Change-Id: Idbceb6c7d4117fbecd35e4261330e6405666189e

    IA: enable SSE fpmath, Separate ARCH_VARIANT and ARCH makefile settings
    Change-Id: I9ba661d68a3b375c21eb6b56442d8ba66a5369b3
    Orig-Change-Id: I60b8121c92b39a60b513bc2496a1e0a21015c586
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>

    x86: Use GCC 4.4.3
    Orig-Change-Id: I083c1afcbb98cfeb48d7bcb7681e5c34db52e767
    Author:    H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>

    x86: the -mbionic flag is needed for IA builds.
    Orig-Change-Id: I00c75f37d7ea46b9f8ad3d7b2ff7094477ff0916
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>

    x86: Disable stack-protector until bionic is fixed
    Orig-Change-Id: I2862de5c1b02490197704f4578a8a91d0565eef0
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>

    Clean up of X86 build flags
    Orig-Change-Id: Ife75c32cd49b32345712dee28fa5f2283069a90e
Signed-off-by: Mark D Horn <mark.d.horn@intel.com>
    Author: Bruce Beare <bruce.j.beare@intel.com>

    x86: Enable -fstack-protector
    Orig-Change-Id: I1fe10159b7a29452ecfc6ba328164948cf9950d6
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>