Add SSE optmized IDCT in JPEG decoding for INTEL Atom platform.

ADD SSE optmized IDCT. It makes album2D workload about 18%
faster than jidctfst.c. The major implementation is at
"jidctintelsse.c".

Change-Id: I6dc6f367158172b468e85e7eae249027eb1766cf
VeNum optimizations

    jpeg-VeNum-optimization-of-IDCT-YCbCr-to-RGB-color-c

    Preserve registers D8-D15 when using VFP as specified by
    AAPCS v2.03

    Additionally had to split jdcolor-armv7.S into two files to
    resolve the issue of constants not being addressable in the
    code segment.

    Remove unused IDCT code

libjpeg: Remove unused idct VeNum references

Change-Id: Iec8433715768fc20b509cc016f76e4c4d816fde7

work-around bug in gcc binutils that causes linker errors when stripping obj code
(cherry picked from commit 02c7af886a156decdc230b18f929885e3051c900)