module: Avoid ABI changes when debug info is disabled

module: Avoid ABI changes when debug info is disabled

Forwarded: not-needed

CI builds are done with debug info disabled, but this removes some
members from struct module and replaces some BTF-related exports with
static definitions.  This causes builds to fail if there is an ABI
reference for the current ABI.

- Add a new config symbol DEBUG_INFO_BTF_MODULES_NOOP which can be
  enabled when DEBUG_INFO is not enabled
- When the symbol is enabled:
  - Define the BTF-related members of struct module
  - Export the no-op definitions of BTF-related functions
  - Define and export the same BTF-related static lists

Gbp-Pq: Topic debian
Gbp-Pq: Name module-avoid-abi-changes-when-debug-info-is-disabled.patch