1.6.23 tarballs have moved so, while we are at modifying libpng.mk, bump to 1.6.25.
[Peter: add back upstream sha1 hash]
Signed-off-by: Julien BOIBESSOT <julien.boibessot@armadeus.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Rebase patch 1 in git format, and rebase patch 2 against 1.6.22.
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>