Fix bazel build: stack-protector

[krisukox]

Description

@swift-nav/devinfra
The error in gnss-converters:

external/libsbp/c/src/sbp.c: In function 'send_payload':
external/libsbp/c/src/sbp.c:580:11: error: stack protector not protecting function: all local arrays are less than 8 bytes long [-Werror=stack-protector]
  580 | static s8 send_payload(sbp_state_t *s, sbp_msg_type_t msg_type, u16 sender_id, u8 len, u8 *payload,
      |           ^~~~~~~~~~~~
cc1: all warnings being treated as errors

It is caused by the -fstack-protector flag, which Bazel c++ rules add by default. In the Bazel submodule update, we enabled -Werror, causing the libsbp build to fail.
I removed the -Wstack-protector flag from libsbp.

Tested here:
https://github.com/swift-nav/gnss-converters-private/pull/1366
https://jenkins.ci.swift-nav.com/blue/organizations/jenkins/swift-nav%2Fgnss-converters-private/detail/PR-1366/1/pipeline/25

API compatibility

Does this change introduce a API compatibility risk?

API compatibility plan

If the above is "Yes", please detail the compatibility (or migration) plan:

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