[PS1] Sigscan for PCSX-reARMed is broken on the latest versions of the libretro core

[Jujstme]

Mostly a placeholder issue to remember working on fixing it.
A possible solution might rely on querying the retro_get_memory_data symbol on the libretro module and retrieving the pointer to the emulated ram from it.

asr/src/emulator/ps1/retroarch.rs

Line 74 in 41a371a

const SIG: Signature<9> = Signature::new("48 8B 35 ?? ?? ?? ?? 81 E2");