update_pch.sh: ignore a icu header file

Change-Id: I2654933e1e6f50902be6b992767ab5caac273f9c
update_pch: add lwp

2m21s -> 47s

Change-Id: I5fd321bb34840c71f22705790aab06e83350261e
fix-includes.pl: lwp

Change-Id: Ib0c5d5c0b0b3c6c290e7e1bbe18464155232ace3
WaE: -Wunused-variable

Change-Id: Ic39102eaa8f0f5f6ea58173103ca8c5dc5c55185