emulators/uae: fix build on armv7
Avoid USES=llvm:15 by manually disabling the offending warning cum
error. Refactor REINPLACE_CMD into proper patches.
Approved by: portmgr (build fix blanket)
Discussed with: bofh
MFH: 2025Q2
(cherry picked from commit a0cc88a429459e903687509682e9f6a48ab07938)