Bug 521926: Eclipse Doc bundles are quite huge (IV) Optimize the PNGs with "optipng -o7 -preserve -strip all" This reduces file size but does not create visual differences. Change-Id: I51f2fcd3f8b1d41d34a04d1ed003b4fe314de52d Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.common/+/190440 Tested-by: Alexander Kurtakov <akurtako@redhat.com> Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>