tree ba1a889e842f196ac9c0766d3a1953dabe8ffa44
parent c8b90beb245ad700c1d7b8f00b75215a83be4193
author Evan McClain <aeroevan@gmail.com> 1319790869 -0400
committer Evan McClain <aeroevan@gmail.com> 1319915872 -0400

Use pngcrush -brute by default.

But fallback to optipng -o7 and then pngout.

This saves ~2M in final .zip size at a cost of ~5 min of build time on
my laptop.

Change-Id: Ic56f677bdc8250f4088f4dbfbfd555ceed5616c2
Signed-off-by: Evan McClain <aeroevan@gmail.com>