This removes warnings emitted by libpng 1.6.10 on any idenitifed files

Files were identified with the command line

find . -name '*.png' -exec identify {} \; 1>/dev/null 2>files

The fix was made with

for i in $(cat files); do mogrify $i -strip $i; done

Change-Id: Ic3b9d19ff6631931ff87e78b1115d0806ba5456e