Drop package/network/services/wireguard/patches/100-portability.patch
Instead pass 'PLATFORM=linux' to make since we are always building FOR
linux.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
(cherry picked from commit f06def4221c25f4ee43d31c2b90a1371ba4d6d33)