[BRLTTY] Patch: support for OCaml-4.04

[Dave Mielke]

[quoted lines by Jaroslav Skarvada on 2016/11/08 at 07:58 -0500]

>it seems that brltty-5.4 doesn't compile with OCaml-4.04.
>Tthe code uses CAMLlocal without calling CAMLparam which is against
>current OCaml documentation. More details in Fedora bug [1]. Attached
>patch should fix the problem

This gives me the following two warnings. How can they be resolved?

./brlapi_stubs.c: In function ‘raise_brlapi_error’:
./brlapi_stubs.c:147:29: warning: unused variable ‘caml__frame’ [-Wunused-variable]
./brlapi_stubs.c: In function ‘raise_brlapi_exception’:
./brlapi_stubs.c:161:29: warning: unused variable ‘caml__frame’ [-Wunused-variable]

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