PR libffi/52221
        * src/x86/ffi.c (ffi_closure_raw_THISCALL): New
        prototype.
        (ffi_prep_raw_closure_loc): Use ffi_closure_raw_THISCALL for
        thiscall-convention.
        (ffi_raw_call): Use ffi_prep_args_raw.
        * src/x86/win32.S (ffi_closure_raw_THISCALL): Add
        implementation for stub.

From-SVN: r184526