games/openclonk: fix build on !amd64

• the problem was that the bundled blake2 impl. was hardwired for SSE2 only
• fix the problem by picking some upstream commits that update blake2 and permit compilation without SSE2
• while here, roll static REINPLACE_CMD into existing patch file as per policy
• pet portlint
• powerpc64 remains broken due to unrelated issue, can't test due to a lack of hardware

Approved by: portmgr (build fix blanket)
MFH: 2025Q3