emulators/rpcs3: unbreak build with clang > 6.0.0

Assertion failed: (D->getCachedLinkage() == LV.getLinkage()), function getLVForDecl, file /usr/src/contrib/llvm/tools/clang/lib/AST/Decl.cpp, line 1394.

PR: 231952
Reported by: pkg-fallout
Submitted by: Roman CAT