WireGuardKitC: fix build with Xcode 16#40

jgonfer wants to merge 1 commit intoWireGuard:masterWireGuard/wireguard-apple:masterfrom

jgonfer:feature/adapt-WireGuardKitC-to-be-built-with-xcode-16jgonfer/wireguard-apple:feature/adapt-WireGuardKitC-to-be-built-with-xcode-16Copy head branch name to clipboard