rilmodem: Use pragma to mask restrict buffer warnings

In file included from drivers/rilmodem/network-registration.c:40:
drivers/rilmodem/network-registration.c: In function ‘ril_cops_list_cb’:
./gril/gril.h:98:11: error: passing argument 1 to restrict-qualified parameter aliases with argument 3 [-Werror=restrict]
   sprintf(print_buf, x);  \
           ^~~~~~~~~
drivers/rilmodem/network-registration.c:583:3: note: in expansion of macro ‘g_ril_append_print_buf’
   g_ril_append_print_buf(nd->ril, "%s [lalpha=%s, salpha=%s, "
   ^~~~~~~~~~~~~~~~~~~~~~
./gril/gril.h:98:11: error: passing argument 1 to restrict-qualified parameter aliases with argument 3 [-Werror=restrict]
   sprintf(print_buf, x);  \
           ^~~~~~~~~
drivers/rilmodem/network-registration.c:593:2: note: in expansion of macro ‘g_ril_append_print_buf’
  g_ril_append_print_buf(nd->ril, "%s}", print_buf);
  ^~~~~~~~~~~~~~~~~~~~~~

In file included from drivers/rilmodem/call-forwarding.c:41:
drivers/rilmodem/call-forwarding.c: In function ‘ril_query_call_fwd_cb’:
./gril/gril.h:98:11: error: passing argument 1 to restrict-qualified parameter aliases with argument 3 [-Werror=restrict]
   sprintf(print_buf, x);  \
           ^~~~~~~~~
drivers/rilmodem/call-forwarding.c:114:3: note: in expansion of macro ‘g_ril_append_print_buf’
   g_ril_append_print_buf(fd->ril, "%s [%d,%d,%d,%s,%d]",
   ^~~~~~~~~~~~~~~~~~~~~~
./gril/gril.h:98:11: error: passing argument 1 to restrict-qualified parameter aliases with argument 3 [-Werror=restrict]
   sprintf(print_buf, x);  \
           ^~~~~~~~~
drivers/rilmodem/call-forwarding.c:124:2: note: in expansion of macro ‘g_ril_append_print_buf’
  g_ril_append_print_buf(fd->ril, "%s}", print_buf);
  ^~~~~~~~~~~~~~~~~~~~~~
2 files changed