Subjects each *.png file that matched grep -law "sRGB" to:
pngcrush -ow -brute -rem allb -reduce -force

Change-Id: Ie8d9a72fde6bf65a63b8786fe2bb1a7c5da1c4b7
Reviewed-by: Topi Reiniö <topi.reinio@theqtcompany.com>