core: build_id: support alternate GNU build ID sources #55
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External build systems may already be enabling GNU build ID, in which case the Memfault provided implementation either breaks the upstream version or doesn't work.
By enabling
MEMFAULT_GNU_BUILD_ID_CUSTOM
the query for the build ID is offloaded to the application.This enables integration with solutions such as zephyrproject-rtos/zephyr#51532, and presumably the final result of zephyrproject-rtos/zephyr#54464