Switch SHA2 symbols from weak to strong aliases There is no good reason to have these as weak symbols at all. And it makes building on Windows (Cygwin, MinGW) harder as it does not support weak symbols. Based-on-patch-by: Michael Haubenwallner <michael.haubenwallner@ssi-schaefer.com> Signed-off-by: Guillem Jover <guillem@hadrons.org>