Revert "package/swupdate: add patch to fix build issue with some toolchains"

This patch caused an unfortunate regression that prevents any handlers
from being registered (runtime issue). This means swupdate cannot
perform any update. Upstream has reverted it.

See discussion:
https://groups.google.com/d/msg/swupdate/oVIhJmYPT8A/eq3uZvYVDQAJ



This reverts commit a8cc6eee.

Signed-off-by: Bjørn Forsman <bjorn.forsman@gmail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Acked-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>