emulators/rpcs3: work around crashes on -CURRENT

RPCS3: PPU[0x1000000] Thread (main_thread) [0x0001d4f8]: SIG: Thread terminated due to fatal error: Segfault writing location 00002b1104240080 at 000000081b67b4ea.
Emu Thread Name: 'PPU[0x1000000] main_thread'.

(cherry picked from commit 49f593b2f77fafebb6586218f7c1cd0aa33de693)