[x86] Android 4.4.4 for x86 needs new implementation of "security_compute_relabel"

Change-Id: I2e15f58f11c9ee74ed8e1b7bf731efd881b890d9
New BIONIC_L(Android-L) has own support for STPCPY

The new BIONIC for android L preview has own support for STPCPY for all
arches. This patch removes inbuilt STPCPY support from busybox when BIONIC_L
is defined.

Change-Id: I189a4489450ca11eddd5b3f49a29f1fe46d0157a
Merge "[x86] Android 4.4.4 for x86 needs new implementation of "security_compute_relabel"" into cm-11.0