Merge libpng version 1.6.58: tag '3061454d980de7d53608f594194cfac722721d2a' - Strip all unneeded files as per README.fuchsia. - Resolve modify/delete conflicts by keeping deletions. Bug: 524829677 Change-Id: Iea319180f6a9673926e65066bdc46c53165f086d Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/libpng/+/1663080 Reviewed-by: Emircan Uysaler <emircan@google.com>