icecc: Exclude linux-libc-headers from building with icecc

:Release Notes:
Exclude linux-libc-headers from building with icecc on x86
architectures.

:Detailed Notes:

:Testing Performed:

:QA Notes:
No change to image.

:Issues Addressed:
[ES-731] linux-libc-headers fail to compile with icecc for x86 MACHINEs

Open-webOS-DCO-1.0-Signed-off-by: Iyad Qumei <iyad.qumei@lge.com>

Change-Id: I6710441170e1b431686b09ff40ce1499e2e8da30
Reviewed-on: https://g2g.palm.com/5417
Reviewed-by: DCO Verification
Reviewed-by: Iyad Qumei <iyad.qumei@lge.com>
Tested-by: Iyad Qumei <iyad.qumei@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>