libc: dont use the linaro strcpy

significant regression here:
Google:
1000000   * strcpy of 15000 bytes: 24.074554 seconds
100000000 * strcpy of 15 bytes:    7.468170 seconds
Linaro:
1000000   * strcpy of 15000 bytes: 63.671265 seconds
100000000 * strcpy of 15 bytes:    12.456329 seconds

Change-Id: I35b431db4d7c1e72adcd7570ab504f6f00179e74
1 file changed