support ffi_type_pointer in ffi.md
@@ -49,6 +49,7 @@ declared in `ffi.h` by libffi.
| "#ulong" [klabel(#ulong), symbol]
| "#slong" [klabel(#slong), symbol]
| "#longdouble" [klabel(#longdouble), symbol]
+ | "#pointer" [klabel(#pointer), symbol]
| "#struct" "(" List ")" [klabel(#struct), symbol]
endmodule
